The product allocation procedure &1 is not used

What causes this issue?

Product allocations procedure &v1& is not yet being used in any product
allocation procedure sequence.

System Response

How to fix this error?

Check your entry against the selection list.
The product allocation procedure sequence is maintained in Product
Allocations Customizing.

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.