How To Fix W8149 - Function only allowed for data type CHAR (not for data type &)

SAP Error Message - Details

• Message type: E = Error

• Message class: W8 - Workflow: Expressions, data flow

• Message number: 149

• Message text: Function only allowed for data type CHAR (not for data type &)

What causes this issue?

A restriction, for which a concrete value is to be stated, can only be
established for character-based fields, because of conversion problems.

System Response

The input of values for non-character-based fields is rejected.

How to fix this error?

You can only check fields which are not character-based for general
value change (value = *).

Error message extract from SAP system. Copyright SAP SE.