How To Fix KX388 - Constant usage for domain & has been defined

KX388 - Overview

• Message type: E = Error

• Message class: KX - EC-EIS/EC-BP: Data basis, data collection

• Message number: 388

• Message text: Constant usage for domain & has been defined

What causes this issue?

You tried to assign a domain which has already been used for a field
with a constant assignment.

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?

You cannot use a domain simultaneously in either a general form (with
all values) nor a restricted form (with assigned constants). You may
choose one or the other option.

Error message extract from SAP system. Copyright SAP SE.

KX388 - Details

• The SAP error message KX388 indicates that a constant usage for a domain has been defined, which typically means that there is an issue with the way a domain is being used in the context of a particular configuration or transaction. This error often arises in the context of controlling (CO) or financial accounting (FI) modules when dealing with cost elements, cost centers, or other financial objects.
  
  Cause:
  
  Domain Definition: The domain in question has been defined with a constant usage, which restricts the values that can be assigned to it. This means that the domain is not set up to allow variable values, and any attempt to assign a non-constant value will trigger this error.
  
  Configuration Issues: There may be a misconfiguration in the settings related to the domain or the specific transaction you are trying to execute.
  Data Entry Errors: Incorrect data entry or attempts to use values that are not allowed