POD-relevant '&' does not exist

What causes this issue?

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

This value does not exist in the PODKZB domain.

System Response

How to fix this error?

Please either enter a correct value or select the value using various F4
input help options.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.