How To Fix GB043 - You have tried to substitute a field that cannot be changed

SAP Error Message - Details

• Message type: E = Error

• Message class: GB - Messages used by the Boolean code generator

• Message number: 043

• Message text: You have tried to substitute a field that cannot be changed

What causes this issue?

You cannot substitute certain fields. These fields are protected in
order to avoid complications with inconsistent data. This substitution
contains a user exit which attempts to substitute a protected field.

System Response

The field retains its original value.

How to fix this error?

You cannot substitute this field. You can display a list of fields that
can be substituted in the substitution editor.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message GB043 - You have tried to substitute a field that cannot be changed ?

  The SAP error message GB043, which states "You have tried to substitute a field that cannot be changed," typically occurs in the context of data entry or processing within SAP, particularly when working with substitution rules in financial accounting or controlling modules. This error indicates that an attempt was made to modify a field that is not allowed to be changed due to system constraints or configuration settings.
  Causes:
  
  Field Restrictions: The field you are trying to substitute may be defined as non-editable in the system configuration. This could be due to the field being part of a standard process that should not be altered.
  Document Status: The document you are working on may be in a status that does not allow changes (e.g., posted documents).
  Substitution Rules: The substitution rules defined in the system may not allow for the specific field to be substituted under the current conditions.
  User Authorizations: The user may not