How To Fix KY391 - '&2' '&1' not allowed due to compound char.

KY391 - Overview

• Message type: E = Error

• Message class: KY - Messages for SAP-EIS: Presentation

• Message number: 391

• Message text: '&2' '&1' not allowed due to compound char.

What causes this issue?

The variable belongs to characteristic '&V2&', which is required for a
compound characteristic. The characteristic '&V3&' is filled with value
'&V4&'. As a compound characteristic exists, a value has to be entered
for the variable, with the existing combination '&V2&' '&V1&' and
'&V3&' '&V4&'.

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?

Enter another value.
It can sometimes be sensible to change the report so that characteristic
'&V3&' is also offered as a variable. Both values can then be entered
together.

Error message extract from SAP system. Copyright SAP SE.

KY391 - Details

• The SAP error message KY391 typically indicates that there is an issue with the use of compound characteristics in the context of Profitability Analysis (CO-PA) or similar modules. This error occurs when a characteristic that is part of a compound characteristic is being used in a way that is not allowed.
  
  Cause:
  The error message KY391 '&2' '&1' not allowed due to compound char. usually arises due to the following reasons:
  
  
  Compound Characteristics: In SAP, certain characteristics can be defined as compound characteristics, which means they are made up of multiple individual characteristics. If you try to use one of the individual characteristics of a compound characteristic in a context where the compound characteristic is expected, this error will occur.
  
  
  Incorrect Configuration: The configuration of the characteristics in the system may not be set up correctly, leading to conflicts when trying to use them in reports or analyses.
  
  
  Data Entry Issues: There may be issues