How To Fix GR540 - Field &, selection set & does not specific a single value

GR540 - Overview

• Message type: E = Error

• Message class: GR - Report Writer

• Message number: 540

• Message text: Field &, selection set & does not specific a single value

What causes this issue?

No representative value has been entered for the selection set. The data
will be assigned the initial value in the corresponding characteristic
in SAP-EIS. As a result, data records with the same key will be
transferred to SAP-EIS.
This can only lead to usable data in SAP-EIS if the values of data
records with the same key are added together when you import the data
into SAP-EIS.

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?

Check whether you need to maintain the representative value in the set,
and whether the transfer rule has been maintained correctly.

Error message extract from SAP system. Copyright SAP SE.

GR540 - Details

• The SAP error message GR540 indicates that a field in a selection set does not specify a single value, which typically occurs when you are trying to execute a report or transaction that requires a specific value for a field, but the input provided does not meet that requirement. This can happen in various contexts, such as when running reports related to inventory management, purchasing, or other modules where selection criteria are used.
  
  Cause:
  
  
  Multiple Values Provided: The field in question may have been populated with multiple values instead of a single value. For example, if you are using a selection screen to filter data, and you have selected multiple items or ranges for a field that expects a single value.
  
  
  Incorrect Input Format: The input format for the field may not be correct, leading the system to interpret it as multiple values.
  
  
  Selection Set Configuration: The selection set may be configured incorrectly, leading