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 Info Record:
  
  Sometimes the internal supplier flag is relevant in the context of the material or info record.
  
  
  
  
  Solution:
  
  
  If the vendor should not be an internal supplier:
  
  Remove the internal supplier flag in the vendor master.
  Transaction: XK02 (Change Vendor)
  Go to Purchasing Data tab and uncheck the Internal Supplier indicator.
  Save the changes.
  Then try creating the PO again.
  
  
  
  If the vendor is correctly flagged as internal supplier:
  
  Do not create a purchase order.
  Use the appropriate internal procurement process, such as:
  
  Stock transfer orders (if moving stock between plants)
  Internal orders or cost center allocations
  Intercompany billing or other internal processes
  
  
  
  
  
  Customizing:
  
  If your business process requires creating POs for internal suppliers (uncommon), you may need to adjust the system logic or user exits, but this is generally not recommended.
  
  
  
  
  Related Information:
  
  Internal Supplier Flag: Used to differentiate between external vendors and internal organizational units.
  Procurement Types:  
  
  External procurement ? Purchase Orders  
  Internal procurement ? Stock transfers, internal orders
  
  
  Error Message Class: WP (Purchasing)
  Transaction Codes:
  
  ME21N - Create Purchase Order
  XK02 - Change Vendor
  XK03 - Display Vendor
  
  
  
  
  Summary:
  
  
  
  Aspect
  Details
  
  
  
  
  Cause
  Vendor is flagged as internal supplier.
  
  
  Effect
  PO creation blocked with WP632 error.
  
  
  Solution
  Remove internal supplier flag or use internal procurement process.
  
  
  Check
  Vendor master data (Purchasing Data tab).
  
  
  
  
  If you need further assistance, please provide details such as vendor number, transaction used, and business scenario.