SAP Message 5D541 - Character &1 is not compatible with combination string from attribute &2

Diagnosis
The SI attributes and their compatibility have been entered in tableT5D1D with different attributes. Information on whether two attributesare compatible, is stored in a combination string. The only validcharacters are 'X', 'W', 'O' or '-'.
Due to a customizing error, the character '&V1&' has been entered. Thisentry cannot be processed.

Procedure for System Administration
Change the SI attribute &V2& entry correspondingly.
From here, you can go to the table maintenance by displaying theentry possibilities and then branching to the table, usingmaintain entries.