How To Fix B1538 - BAPI field contains SAP code. You cannot enter a value.

B1538 - Overview

• Message type: E = Error

• Message class: B1 - ALE group messages

• Message number: 538

• Message text: BAPI field contains SAP code. You cannot enter a value.

What causes this issue?

If the field in the external structure contains an SAP code, a field
cannot be assigned to it from the internal structure. An SAP code can
only be assigned to an ISO code from the external structure on the
detail screen.
The SAP code field that is used for mapping the contents of the field
from the external structure is also determined by the ISO code.

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?

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message B1538 - BAPI field contains SAP code. You cannot enter a value. ?

  The SAP error message B1538 indicates that a BAPI (Business Application Programming Interface) field is being populated with a value that is not allowed. Specifically, the message states that the field contains an SAP code, and you cannot enter a value in that field. This typically occurs when the BAPI is expecting a specific format or type of data, and the input does not meet those criteria.
  
  Cause:
  
  Invalid Input Value: The value being passed to the BAPI field is not valid according to the field's data type or constraints.
  Field Restrictions: The field may be restricted to certain values (e.g., predefined codes or enumerations) and the input does not match any of those.
  Data Mapping Issues: There may be a mismatch between the data being sent from the calling program and the expected data structure of the BAPI.
  
  Configuration Issues: The BAPI might be configured to accept only certain values based on business logic