> For the complete documentation index, see [llms.txt](https://docs.xorosoft.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.xorosoft.com/developers-api/purchase-order-management/create-sales-order-purchase-order-links.md).

# Create Sales Order-Purchase Order Links

The Link Orders API is used to create, update, or delete links between Sales Orders (SO) and Purchase Orders (PO).

* **To create or update** a link: send SO/PO line IDs with a non-zero quantity.
* **To delete** a link: set the quantity to 0.

| Field      | Data Type | Default Value | Description                                    |
| ---------- | --------- | ------------- | ---------------------------------------------- |
| `SoNumber` | string    | NA            | Sales Order number to be linked..              |
| `PoNumber` | string    | NA            | Purchase Order number to be linked..           |
| `Lines`    | array     | \[]           | List of SO and PO line link mappings.          |
| `SoLineId` | integer   | NA            | Line ID of the Sales Order to be linked.       |
| `PoLineId` | integer   | NA            | Line ID of the Purchase Order to be linked.    |
| `Qty`      | decimal   | 0             | Quantity being linked between SO and PO lines. |

```json
{"openapi":"3.0.3","info":{"title":"Xorosoft ERP Public API","version":"2026.07"},"tags":[{"name":"Purchase Order Management","description":"Use Purchase Order Management APIs to create, import, release, close, link, and retrieve purchase orders. These endpoints support vendor purchasing, dropship workflows, incoming delivery visibility, transfer purchase orders, and sales-order-to-purchase-order linking. They are useful for procurement, supplier portals, 3PL coordination, and integrations that need to keep inbound supply synchronized with Xorosoft ERP."}],"servers":[{"url":"https://res.xorosoft.io","description":"Xorosoft ERP API server"}],"security":[{"basic":[]}],"components":{"securitySchemes":{"basic":{"scheme":"basic","type":"http"}}},"paths":{"/api/xerp/purchaseorder/createsopoorderlinking":{"post":{"responses":{"200":{"content":{"application/json":{"schema":{"properties":{"Data":{"properties":{"ErrorList":{"items":{},"type":"array"},"SuccessList":{"items":{"properties":{"OrderLinkingArr":{"items":{"properties":{"CreateDttm":{"type":"string"},"CreateSource":{"type":"string"},"Id":{"type":"number"},"IsDropshipFlag":{"type":"boolean"},"IsThirdPartyLinking":{"type":"boolean"},"ItemId":{"type":"number"},"ItemNumber":{"type":"string"},"ItemTypeId":{"type":"number"},"LinkedPONumber":{"type":"string"},"LinkedPOQty":{"type":"number"},"LinkedSONumber":{"type":"string"},"LinkedSOQty":{"type":"number"},"PoId":{"type":"number"},"PoLineId":{"type":"number"},"PoOrderedQty":{"type":"number"},"Qty":{"type":"number"},"SoId":{"type":"number"},"SoLineId":{"type":"number"},"SoOrderedQty":{"type":"number"},"SoQtyShipped":{"type":"number"},"StoreId":{"type":"number"},"UomId":{"type":"number","nullable":true}},"type":"object"},"type":"array"},"PoNumber":{"type":"string"},"SoNumber":{"type":"string"}},"type":"object"},"type":"array"}},"type":"object"},"IsForwardRequest":{"type":"boolean"},"Message":{"type":"string"},"MessageTitle":{"type":"string","nullable":true},"Result":{"type":"boolean"}},"type":"object"}}},"description":"OK","headers":{}}},"tags":["Purchase Order Management"],"description":"The Link Orders API is used to create, update, or delete links between Sales Orders (SO) and Purchase Orders (PO).\n\n<ul>\n  <li><strong>To create or update</strong> a link: send SO/PO line IDs with a non-zero quantity.</li>\n  <li><strong>To delete</strong> a link: set the quantity to 0.</li>   \n</ul>\n\nField               |Data Type          |Default Value          |Description\n-------------------|-------------------|-------------------|--------------\n``SoNumber``|string|NA|Sales Order number to be linked..\n``PoNumber``|string|NA|Purchase Order number to be linked..\n``Lines``|array|[]|List of SO and PO line link mappings.\n``SoLineId``|integer|NA|Line ID of the Sales Order to be linked.\n``PoLineId``|integer|NA|Line ID of the Purchase Order to be linked.\n``Qty``|decimal|0|Quantity being linked between SO and PO lines.","operationId":"post_purchaseorder_createsopoorderlinking","requestBody":{"content":{"application/json":{"schema":{"items":{"properties":{"Lines":{"items":{"properties":{"PoLineId":{"type":"number"},"Qty":{"type":"number"},"SoLineId":{"type":"number"}},"type":"object"},"type":"array"},"PoNumber":{"type":"string"},"SoNumber":{"type":"string"}},"type":"object"},"type":"array"}}}},"summary":"Create Sales Order-Purchase Order Links"}}}}
```


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