How To Fix B1406 - Assignment not allowed

SAP Error Message - Details

• Message type: E = Error

• Message class: B1 - ALE group messages

• Message number: 406

• Message text: Assignment not allowed

What causes this issue?

The assignment of message type to IDoc type for ALE must be one of
the allowed assignments between message type and IDoc type.

How to fix this error?

Check your input.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message B1406 - Assignment not allowed ?

  The SAP error message B1406 "Assignment not allowed" typically occurs in the context of business partner or customer/vendor master data management. This error indicates that there is an issue with the assignment of a business partner to a particular role or the assignment of a customer/vendor to a specific account group.
  Causes:
  
  Role Assignment Issues: The business partner may not be assigned to the correct role that allows for the transaction you are trying to perform.
  Account Group Restrictions: The account group associated with the business partner may have restrictions that prevent the assignment.
  Data Inconsistencies: There may be inconsistencies or missing data in the master data records that prevent the assignment.
  Configuration Settings: The configuration settings in the SAP system may not allow for the assignment due to specific rules or validations set up in the system.
  
  Solutions:
  
  Check Role Assignments: Ensure that the business partner has the correct roles assigned. You can do this by navigating to the business partner transaction (e.g., BP) and checking the roles assigned to the partner.
  Review Account Group Settings: Verify the settings of the account group associated with the business partner. Ensure that it allows for the type of assignment you are trying to make.
  Validate Master Data: Check for any missing or inconsistent data in the master data records. Ensure that all required fields are filled out correctly.
  Consult Configuration: If you have access, review the configuration settings in the SAP system related to business partner and customer/vendor assignments. This may require assistance from a functional consultant or system administrator.
  Error Logs: Check the error logs for more detailed information about the error. This can provide insights into what specifically is causing the issue.
  
  Related Information:
  
  Transaction Codes: Common transaction codes related to business partner management include BP (Business Partner), XK01/XK02 (Create/Change Vendor), and XD01/XD02 (Create/Change Customer).
  SAP Notes: Search for relevant SAP Notes in the SAP Support Portal that may address specific issues related to error B1406.
  Documentation: Review SAP documentation or help files related to business partner management for additional context and troubleshooting steps.
  
  If the issue persists after trying the above solutions, it may be beneficial to consult with your SAP support team or a functional consultant who specializes in master data management.