Distribution key &1 is not supported

What causes this issue?

You want to use distribution key &V1&. This <DS:DE.SPRED>distribution
key</> is not relevant in this context, therefore it is not supported.

System Response

The system does not allow you to use this distribution key.

How to fix this error?

Please choose another distribution key. Please note that only equal and
analog distribution keys are supported.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.