Char. value &2 of characteristic &1 correpsonds to the default value

What causes this issue?

At least one of the selected FS items has breakdown type 4 (required
breakdown, default value forbidden) regarding characteristic &V1&.
Characteristic value &V2& corresponds exactly to the default value of
the characteristic.

System Response

Error message

How to fix this error?

Select another characteristic value for &V1& or check the breakdown
tpyes of the FS items used, regarding &V1&.

Procedure for System Administrators

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

Error message extract from SAP system. Copyright SAP SE.