How To Fix WB2B2156 - Change of supplier is not possible, because of assignment

SAP Error Message - Details

• Message type: E = Error

• Message class: WB2B2 - Trading Contract (part 2)

• Message number: 156

• Message text: Change of supplier is not possible, because of assignment

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message WB2B2156 - Change of supplier is not possible, because of assignment ?

  The SAP error message WB2B2156, which states "Change of supplier is not possible, because of assignment," typically occurs in the context of supplier management within the SAP system, particularly when dealing with purchasing documents or supplier master data.
  Cause:
  This error usually arises due to one of the following reasons:
  
  
  Existing Assignments: The supplier you are trying to change is currently assigned to one or more purchasing documents (like purchase orders, contracts, etc.). SAP does not allow changes to supplier data if there are active assignments that could be affected by the change.
  
  
  Data Integrity Constraints: SAP enforces data integrity rules to ensure that changes do not lead to inconsistencies in the purchasing process. If the supplier is linked to transactions, the system will prevent changes to avoid potential data issues.
  
  
  Status of the Supplier: The supplier may be in a status that does not allow changes, such as being marked as inactive or blocked.
  
  
  Solution:
  To resolve this error, you can take the following steps:
  
  
  Check Assignments: Review the purchasing documents and other assignments related to the supplier. You can use transaction codes like ME23N (Display Purchase Order) or ME2N (Purchase Orders by Supplier) to find any active documents linked to the supplier.
  
  
  Remove or Update Assignments: If there are active assignments, you may need to either:
  
  Change the supplier in the purchasing documents to another supplier.
  Delete or close the purchasing documents if they are no longer needed (ensure this is in line with your organization's policies).
  
  
  
  Supplier Status: Check the status of the supplier in the supplier master data. If the supplier is blocked or inactive, you may need to change its status to active before making any modifications.
  
  
  Consult with Stakeholders: If you are unsure about the implications of changing the supplier, consult with relevant stakeholders (like procurement or finance teams) to ensure that the change is appropriate.
  
  
  Use Transaction Codes: Utilize transaction codes such as XK02 (Change Vendor) to attempt the change after resolving any issues with assignments.
  
  
  Related Information:
  
  
  Transaction Codes: Familiarize yourself with relevant transaction codes for managing suppliers, such as:
  
  XK01: Create Vendor
  XK02: Change Vendor
  XK03: Display Vendor
  ME23N: Display Purchase Order
  ME2N: Purchase Orders by Supplier
  
  
  
  SAP Notes: Check SAP Notes for any specific patches or updates related to this error message, as there may be known issues or fixes provided by SAP.
  
  
  Documentation: Refer to SAP documentation or help files for more detailed information on supplier management and error handling.
  
  
  By following these steps, you should be able to identify the cause of the error and take appropriate action to resolve it.