> ## Documentation Index > Fetch the complete documentation index at: https://developer.jtl-software.com/llms.txt > Use this file to discover all available pages before exploring further. # Create Purchase Order Line Item > Adds one article position to an existing purchase order. The order must be Open or Released — from InProgress onwards the position would already be part of a goods receipt. The article must already be assigned to the order's supplier; this endpoint never creates that assignment. Fields the caller omits are resolved from the supplier's master data, so the smallest useful request carries the article, the quantity, the net price and the VAT rate. ## OpenAPI ````yaml /openapi/erp/2.2.json post /v2/purchase-orders/{purchaseOrderId}/line-items openapi: 3.0.0 info: title: JTL-WAWI API (Cloud) description: "JTL-Wawi-Version: 2.3.0-alpha.864+Sha.5f010e2\r\n# Introduction\r\n\r\nWelcome to the JTL-WAWI technical API documentation. This guide is here to help developers understand how our REST API works and how it can be integrated into your existing systems. We'll delve into the details of authentication and data manipulation processes, providing clear examples along the way. Whether you're a developer or an IT professional, this documentation aims to give you a practical understanding, laying the groundwork for effectively using the JTL-WAWI API to enhance your processes.\r\n\r\n# Authentication\r\n\r\nYou register your application with the API by sending a POST request with the required information and corresponding keys. You can find the exact request details at https://developer.jtl-software.com/products/erp/swagger/appregistration. This information has to include the following:\r\n\r\n* AppId\r\n* DisplayName\r\n* Description\r\n* Version\r\n* ProviderName\r\n* ProviderWebsite\r\n* MandatoryApiScopes\r\n\r\nThis data is crucial for identifying and registering your application with the API. The API uses it to generate a temporary authentication ID that allows your application to access the necessary resources. After successful validation of this information, you will receive the API key required for future authentication and API requests.\r\n\r\nBefore you can begin the registration process, you must open JTL-Wawi (new interface) and start the registration process under 'Admin->App registration'. Only at this point are you authorised to send the first API call. This step in JTL-Wawi ensures that your application is properly registered and has permission to use the API.\r\n\r\nThe API will send you an authentication ID in the form of a token. Once you have received this token and successfully completed the registration in JTL-Wawi, you will send another request to the API by including this authentication ID in the URL path.\r\n\r\nAfter successful validation of this second request by the API and confirmation of the correct information, you will be provided with the actual API key. It is important to note that this API key will not be displayed again!\r\n\r\nThis API key will be used in the future to authenticate requests to the API. It is of utmost importance that you securely store the API key upon receipt, as it cannot be retrieved from any other location in the system." contact: name: JTL-Software-GmbH url: https://developer.jtl-software.com/ email: partner@jtl-software.com version: '2.2' x-application-version: 2.3.0.0 servers: - url: https://api.jtl-cloud.com/erp description: Production Environment Cloud API Gateway security: [] tags: - name: WMS description: >-

Query all pick lists for a specific wms warehouse that are not completed. - name: Wawi App description: >-

Get a specific customer - name: Warehouses description: >-

Queries all storage locations for a given warehouse. - name: Units description: Development - name: Transaction Status description: >-

Queries all transaction statuses for a sales order. - name: Tax description: >-

Returns the tax rate for the given item. - name: Inventory description: >-

Queries stocks for a specific item, warehouse or storage location. - name: Sales Order description: Planned - name: Sales Invoice Correction description: Planned - name: Return description: >-

Create a new return with associated items and packages. - name: Item description: >-

Queries all responsible persons. - name: Refund description: Planned - name: Property description: >-

Queries all properties of items. - name: Printer description: >-

Retrieves all installed printers. - name: Master Data description: >-

Queries all on hold reasons for sales orders. - name: Manufacturer description: Development - name: Label description: Development - name: Sales Invoice description: Planned - name: Info description: >-

Returns the status of the API. - name: Features description: >-

Returns the available feature sets with release state and API version. - name: Extensibility description: Planned - name: Shipment description: Development - name: Delivery Note description: Planned - name: Custom Field description: Development - name: Customer description: >-

Deletes a specific customer. - name: Authentication description: >-

DEPRECATED seit Wawi 2.2.0: No-Op. Seit Wawi 2.1.0 registriert sich die Wawi selbst per JWT. - name: Attribute description: Development - name: Sales Quotation description: >-

Execute the printing of a sales quotation - name: Production - name: Resources - name: Company - name: Sales Orders - name: Marketplace Order - name: Marketplace Offer - name: Marketplace Invoicing - name: Sales Channel - name: Payment - name: Warehouse Assistant - name: Worker paths: /v2/purchase-orders/{purchaseOrderId}/line-items: post: tags: - wawi - Purchase Order summary: Create Purchase Order Line Item description: >- Adds one article position to an existing purchase order. The order must be Open or Released — from InProgress onwards the position would already be part of a goods receipt. The article must already be assigned to the order's supplier; this endpoint never creates that assignment. Fields the caller omits are resolved from the supplier's master data, so the smallest useful request carries the article, the quantity, the net price and the VAT rate. operationId: PurchaseOrderDomain_CreatePurchaseOrderLineItem parameters: - name: purchaseOrderId in: path required: true description: ID of the purchase order the position is added to. schema: $ref: >- #/components/schemas/JTL.Data.Contracts.Keys.LieferantenBestellungKey - name: disableAutomaticWorkflows in: query required: true description: >- Indicates whether automatic workflows should be suppressed for this write. Defaults to false when omitted. schema: type: boolean - name: Idempotency-Key in: header description: >- Optional, client-generated key for deduplicating repeated write requests. A repeated request with the same key returns the originally recorded result instead of executing the effect again. schema: type: string maxLength: 255 minLength: 1 - name: x-tenant-id in: header required: true schema: type: string format: uuid description: The tenant ID for the target ERP instance. requestBody: x-name: CreatePurchaseOrderLineItemRequest description: '' content: application/json: schema: $ref: >- #/components/schemas/JTL.Wawi.PurchaseOrders.PublicApi.Endpoints.V2.PurchaseOrderDomain.CreatePurchaseOrderLineItemRequest required: true x-position: 1 responses: '201': description: >- The position was added. The body carries its new ID, which is all the caller needs to address it afterwards — the order-level consequences of the write (recalculated totals, open quantities) are visible through a subsequent read of the order. content: application/json: schema: $ref: >- #/components/schemas/JTL.Wawi.PurchaseOrders.PublicApi.DataTransferObjects.V2.PurchaseOrderDomain.CreatePurchaseOrderLineItemCommandResponse '400': description: >- The request is invalid. The body is an RFC 7807 ValidationProblemDetails whose "Errors" map keys the offending property to its message; the shared exception handler emits only those messages and does NOT put the internal error code on the wire. Rejection reasons: the order is neither Open nor Released; the article is not assigned to the order's supplier, or is a kit article, inactive, or a variation parent; the quantity is not greater than zero; the net purchase price is negative; the VAT rate is outside 0 to 100; a numeric value exceeds the range of the column that stores it; the note exceeds its length; or the purchase order id is not a positive number. content: application/json: schema: $ref: '#/components/schemas/FastEndpoints.ProblemDetails' '401': description: Unauthorized. content: application/json: schema: $ref: '#/components/schemas/FastEndpoints.ProblemDetails' '403': description: Forbidden. content: application/json: schema: $ref: '#/components/schemas/FastEndpoints.ProblemDetails' '404': description: >- The purchase order was not found — it does not exist, this API does not expose it (soft-deleted, warehouse transfer, price inquiry, dropshipping, non-procurement supplier), or it disappeared between validation and the write. The cases are indistinguishable by design (WAWI-92251). content: application/json: schema: $ref: '#/components/schemas/FastEndpoints.ProblemDetails' '500': description: Internal server error. content: application/json: schema: $ref: '#/components/schemas/FastEndpoints.ProblemDetails' security: - oauth2-authorization-code: - purchaseorders.write - oauth2-client-credentials: - purchaseorders.write components: schemas: JTL.Data.Contracts.Keys.LieferantenBestellungKey: type: string description: Der LieferantenBestellung Schlüssel. format: uuid example: b45f6432-2462-4c6f-b00f-1d9d01000000 additionalProperties: false JTL.Wawi.PurchaseOrders.PublicApi.Endpoints.V2.PurchaseOrderDomain.CreatePurchaseOrderLineItemRequest: type: object description: >- Request model for CreatePurchaseOrderLineItem command endpoint. Route parameters bind from the route, query parameters from the query string, everything else from the body. additionalProperties: false required: - itemId - quantity - netPurchasePriceAmount - vatRatePercentage properties: itemId: $ref: '#/components/schemas/JTL.Data.Contracts.Keys.ArtikelKey' description: >- The article to order. It must already be assigned to the order's supplier; the API never auto-assigns. Kit articles, inactive articles and variation parents are rejected, exactly as on the create-order endpoint. quantity: type: number description: Ordered quantity; must be greater than zero. format: decimal netPurchasePriceAmount: type: number description: >- Net purchase price per unit. Zero is allowed — it is the underlying column's own default — but a negative price is not. format: decimal vatRatePercentage: type: number description: >- VAT rate in percent, between 0 and 100 inclusive. A sanity bound only; specific rates are not whitelisted. format: decimal supplierItemNumber: type: string description: >- The supplier's own article number for this position. When omitted, resolved from the supplier's master data. A supplied value is used as given even when it differs from master data, because this is a free-text snapshot rather than a lookup key. deliveryDate: type: string description: >- Expected delivery date of this position. When omitted, calculated from the article's (or, failing that, the supplier's) lead time in days, added to today. format: date-time note: type: string description: Free-text note on the position, at most 2000 characters. JTL.Wawi.PurchaseOrders.PublicApi.DataTransferObjects.V2.PurchaseOrderDomain.CreatePurchaseOrderLineItemCommandResponse: type: object description: >- Adds one article position to an existing purchase order. The order must be Open or Released — from InProgress onwards the position would already be part of a goods receipt. The article must already be assigned to the order's supplier; this endpoint never creates that assignment. Fields the caller omits are resolved from the supplier's master data, so the smallest useful request carries the article, the quantity, the net price and the VAT rate. - Response additionalProperties: false required: - lineItemId properties: lineItemId: $ref: >- #/components/schemas/JTL.Data.Contracts.Keys.LieferantenBestellungPosKey description: Unique ID of the newly created line item. FastEndpoints.ProblemDetails: type: object additionalProperties: false properties: type: type: string default: https://www.rfc-editor.org/rfc/rfc7231#section-6.5.1 title: type: string default: One or more validation errors occurred. status: type: integer format: int32 default: 400 instance: type: string default: /api/route traceId: type: string default: 0HMPNHL0JHL76:00000001 detail: type: string errors: type: array items: $ref: '#/components/schemas/FastEndpoints.ProblemDetails_Error' JTL.Data.Contracts.Keys.ArtikelKey: type: string format: uuid example: b45f6432-2462-4c6f-b00f-1d9d01000000 additionalProperties: false JTL.Data.Contracts.Keys.LieferantenBestellungPosKey: type: string description: Der LieferantenBestellungPos Schlüssel. format: uuid example: b45f6432-2462-4c6f-b00f-1d9d01000000 additionalProperties: false FastEndpoints.ProblemDetails_Error: type: object additionalProperties: false properties: name: type: string default: Error or field name reason: type: string default: Error reason code: type: string severity: type: string securitySchemes: oauth2-authorization-code: type: oauth2 flows: authorizationCode: authorizationUrl: https://auth.jtl-cloud.com/oauth2/auth tokenUrl: https://auth.jtl-cloud.com/oauth2/token scopes: inventories.write: Grants permission to modify stock levels. inventory.read: Grants permission to read stock levels. inventory.write: Grants permission to modify stock levels. items.read: Grants permission to read item data. items.write: Grants permission to create and modify item data. procurements.read: Beschaffung lesen saleschannels.read: Grants permission to read sales channels. saleschannels.write: Grants permission to create and modify sales channels. all.read: Allows the application to read all data. customers.read: Grants permission to read customer data. customers.write: Grants permission to create and modify customer data. customfields.read: Grants permission to read custom fields. customfields.write: Grants permission to create and modify custom fields. deliveries.read: Grants permission to read deliveries. deliveries.write: Grants permission to create and modify deliveries. deliverynotes.print: Grants permission to print and output delivery notes. deliverynotes.read: Grants permission to read delivery notes. deliverynotes.write: Grants permission to create and modify delivery notes. extensibility.integration: >- Grants permission to manage extensions and integrations of the JTL-Wawi. inventories.read: Grants permission to read stock levels. invoices.read: Grants permission to read invoices. invoices.write: Grants permission to create and modify invoices. labels.read: Grants permission to read labels. labels.write: Grants permission to create and modify labels. masterdata.read: >- Read master data such as shipping methods, payment methods, color codes and tax classes. orders.read: Grants permission to read orders. picklists.read: Grants permission to read pick lists. picklists.write: Grants permission to create and modify pick lists. returns.read: Grants permission to read returns. returns.write: Grants permission to create and modify returns. salesinvoicecorrections.read: Grants permission to read invoice corrections. salesinvoicecorrections.write: Grants permission to create and modify invoice corrections. salesorders.print: Grants permission to print and output sales orders. salesorders.read: Grants permission to read sales orders. salesorders.write: Grants permission to create and modify sales orders. system.config.read: Grants permission to read the system configuration. system.config.write: Grants permission to modify the system configuration. taxes.read: Grants permission to read tax data. warehouse.read: Grants permission to read warehouse data. wawiapp.all: Grants access to Wawi app related operations. currencies.read: Grants read access to currencies. jera.read: Grants read access to JERA internal endpoints. paymentmethods.read: Grants read access to payment methods. payments.read: Ermöglicht den Lesezugriff auf Zahlungen. payments.write: Ermöglicht den Schreibzugriff auf Zahlungen. salesinvoicecorrections.print: Grants permission to print and output invoice corrections. salesinvoices.print: Grants permission to print and output sales invoices. salesinvoices.read: Grants read access to sales invoices. salesinvoices.write: Grants write access to sales invoices. salesquotations.print: Grants permission to print and output sales quotations. salesquotations.read: Grants read access to sales quotations. salesquotations.write: Grants write access to sales quotations. system.worker.read: Worker-Synchronisationen lesen system.worker.write: Worker-Synchronisationen schreiben resources.read: Grants permission to read resource management data. resources.write: Grants permission to create and modify resource management data. pps.read: Grants permission to read production data. pps.write: Grants permission to create and modify production data. channels.read: Grants permission to read marketplace channels. invoices.print: >- Grants permission to print marketplace external documents (invoices, credit notes). marketplaceoffers.read: Grants permission to read marketplace offers and offer failures. marketplaceoffers.write: Grants permission to create and modify marketplace offers. notifications.read: Grants permission to read marketplace notifications. orders.write: >- Grants permission to modify marketplace order data (exclude/reset cancellation, payment, return and shipping uploads). masterdata.write: Write master data taxes.write: Grants permission to create and modify tax data. application.runas: >- Allows the application to execute requests on behalf of another user. oauth2-client-credentials: type: oauth2 flows: clientCredentials: tokenUrl: https://auth.jtl-cloud.com/oauth2/token scopes: inventories.write: Grants permission to modify stock levels. inventory.read: Grants permission to read stock levels. inventory.write: Grants permission to modify stock levels. items.read: Grants permission to read item data. items.write: Grants permission to create and modify item data. procurements.read: Beschaffung lesen saleschannels.read: Grants permission to read sales channels. saleschannels.write: Grants permission to create and modify sales channels. all.read: Allows the application to read all data. customers.read: Grants permission to read customer data. customers.write: Grants permission to create and modify customer data. customfields.read: Grants permission to read custom fields. customfields.write: Grants permission to create and modify custom fields. deliveries.read: Grants permission to read deliveries. deliveries.write: Grants permission to create and modify deliveries. deliverynotes.print: Grants permission to print and output delivery notes. deliverynotes.read: Grants permission to read delivery notes. deliverynotes.write: Grants permission to create and modify delivery notes. extensibility.integration: >- Grants permission to manage extensions and integrations of the JTL-Wawi. inventories.read: Grants permission to read stock levels. invoices.read: Grants permission to read invoices. invoices.write: Grants permission to create and modify invoices. labels.read: Grants permission to read labels. labels.write: Grants permission to create and modify labels. masterdata.read: >- Read master data such as shipping methods, payment methods, color codes and tax classes. orders.read: Grants permission to read orders. picklists.read: Grants permission to read pick lists. picklists.write: Grants permission to create and modify pick lists. returns.read: Grants permission to read returns. returns.write: Grants permission to create and modify returns. salesinvoicecorrections.read: Grants permission to read invoice corrections. salesinvoicecorrections.write: Grants permission to create and modify invoice corrections. salesorders.print: Grants permission to print and output sales orders. salesorders.read: Grants permission to read sales orders. salesorders.write: Grants permission to create and modify sales orders. system.config.read: Grants permission to read the system configuration. system.config.write: Grants permission to modify the system configuration. taxes.read: Grants permission to read tax data. warehouse.read: Grants permission to read warehouse data. wawiapp.all: Grants access to Wawi app related operations. currencies.read: Grants read access to currencies. jera.read: Grants read access to JERA internal endpoints. paymentmethods.read: Grants read access to payment methods. payments.read: Ermöglicht den Lesezugriff auf Zahlungen. payments.write: Ermöglicht den Schreibzugriff auf Zahlungen. salesinvoicecorrections.print: Grants permission to print and output invoice corrections. salesinvoices.print: Grants permission to print and output sales invoices. salesinvoices.read: Grants read access to sales invoices. salesinvoices.write: Grants write access to sales invoices. salesquotations.print: Grants permission to print and output sales quotations. salesquotations.read: Grants read access to sales quotations. salesquotations.write: Grants write access to sales quotations. system.worker.read: Worker-Synchronisationen lesen system.worker.write: Worker-Synchronisationen schreiben resources.read: Grants permission to read resource management data. resources.write: Grants permission to create and modify resource management data. pps.read: Grants permission to read production data. pps.write: Grants permission to create and modify production data. channels.read: Grants permission to read marketplace channels. invoices.print: >- Grants permission to print marketplace external documents (invoices, credit notes). marketplaceoffers.read: Grants permission to read marketplace offers and offer failures. marketplaceoffers.write: Grants permission to create and modify marketplace offers. notifications.read: Grants permission to read marketplace notifications. orders.write: >- Grants permission to modify marketplace order data (exclude/reset cancellation, payment, return and shipping uploads). masterdata.write: Write master data taxes.write: Grants permission to create and modify tax data. application.runas: >- Allows the application to execute requests on behalf of another user. ````