How To Fix WP632 - Internal suppliers are not allowed for purchase order generation

SAP Error Message - Details

• Message type: E = Error

• Message class: WP - Messages from POS interface

• Message number: 632

• Message text: Internal suppliers are not allowed for purchase order generation

What causes this issue?

Supplier &V1& is an internal supplier. You must enter an external
supplier so that you can automatically create a purchase order for
material &V2& in the background.

System Response

You can enter the correct supplier for the goods receipt item by using
the following transaction.
The transaction is started automatically immediately after this
information screen and is supplied with values from the goods receipt
interface.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message WP632 - Internal suppliers are not allowed for purchase order generation ?

  SAP Error Message:
  WP632 - Internal suppliers are not allowed for purchase order generation
  
  
  Cause:
  This error occurs when you try to create a purchase order (PO) for a vendor that is flagged as an internal supplier in SAP. Internal suppliers are typically organizational units or plants within the same company that supply goods or services internally rather than external vendors. SAP standard configuration prevents the creation of purchase orders for internal suppliers because internal procurement is usually handled differently (e.g., via stock transfers or internal orders).
  
  Explanation:
  
  In SAP, vendors can be flagged as internal suppliers in the vendor master data.
  When a vendor is marked as internal supplier, the system expects procurement to be handled internally, not through standard purchase orders.
  Attempting to create a PO for such a vendor triggers the WP632 error.
  
  
  How to Check:
  
  
  Vendor Master Data:
  
  Transaction: XK03 (Display Vendor)
  Check the Purchasing Data tab.
  Look for the indicator Internal Supplier (field: INTERN).
  
  
  
  Material Master or Purchasing