How To Fix SCPR476 - Key field &1 of type "GUID/UUID" cannot be variable

SAP Error Message - Details

• Message type: E = Error

• Message class: SCPR - BC Sets

• Message number: 476

• Message text: Key field &1 of type "GUID/UUID" cannot be variable

What causes this issue?

You have tried to assign the attribute "Variable" (Get value at
activation) to the key field &V1& of table &V2&, in the customizing
object &V3& (name: '&V4&'), either actively (with the pushbutton in the
BC Set maintenance transaction), or else the attribute was set
automatically by the system when you tried to not put the field in the
BC Set. Keys cannot be completely deselected.
This field is flagged as a GUID (global unique identifier) or UUID
(universal unique identifier), which are unique, unchangeable values,
which cannot be variable at activation.

System Response

The system does not let you change from FIX (unchangeable after
activation) to "Variable", or resets the value from "Variable" to FIX,
as is usual for key fields.

How to fix this error?

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.