How To Fix OL392 - Inconsistent key field definition in function module &

OL392 - Overview

• Message type: E = Error

• Message class: OL - Workflow object types: Run-time system

• Message number: 392

• Message text: Inconsistent key field definition in function module &

What causes this issue?

In the function module interface, either export parameters with the
same name must be defined for all key fields of the corresponding
object type (only for class methods which involve methods which create
an instance) or there can be no export parameters whose names
correspond to the key field names for the object type (instance remains
unchanged).

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 should change the function module accordingly and then transfer the
function again as a method.
More information about key fields can be found in the BAPI
Implementation Guide.

Error message extract from SAP system. Copyright SAP SE.

OL392 - Details

• The SAP error message OL392, which states "Inconsistent key field definition in function module &," typically occurs when there is a mismatch in the key field definitions between the function module and the data structure or table it is trying to access. This inconsistency can arise from various reasons, such as changes in the data model, incorrect configuration, or issues with the function module itself.
  Causes:
  
  Data Structure Changes: If the underlying data structure or table has been modified (e.g., fields added, removed, or changed) without updating the corresponding function module, this error can occur.
  Function Module Definition: The function module may have been incorrectly defined, leading to mismatches in expected key fields.
  Transport Issues: If the function module was transported from one system to another without the corresponding data structure changes, inconsistencies may arise.
  Custom Development: If there are custom developments that interact with standard SAP function modules, they may not align with the