How To Fix WW104 - Assignment of & cannot be deleted

WW104 - Overview

• Message type: E = Error

• Message class: WW - Material group master maintenance

• Message number: 104

• Message text: Assignment of & cannot be deleted

What causes this issue?

You want to delete an existing assignment to a material group. This is
prohibited as long as value-only materials are still assigned in the
plant master/material group master.

System Response

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

How to fix this error?

Delete all value-only material assignments from the corresponding
plant/material group assignment(s).

Error message extract from SAP system. Copyright SAP SE.

WW104 - Details

• The SAP error message WW104 ("Assignment of & cannot be deleted") typically occurs in the context of work center assignments, production orders, or similar scenarios where a specific assignment cannot be removed due to various constraints or dependencies.
  
  Cause:
  
  Dependencies: The assignment you are trying to delete may be linked to other objects or processes that prevent its removal. For example, if the assignment is part of an active production order or is being referenced in a planning scenario, it cannot be deleted.
  Status of the Object: The object (e.g., work center, production order) may be in a status that does not allow for changes or deletions. For instance, if the production order is already released or completed, certain assignments may be locked.
  Authorization Issues: The user may not have the necessary permissions to delete the assignment, leading to this error message.
  Data Integrity Constraints: SAP enforces data integrity rules that may prevent the deletion