The variant & is obsolete and can no longer be read; it has been deleted

What causes this issue?

The data structures have been changed. As a result, the variant can no
longer be processed.

System Response

The system has deleted the variant.

How to fix this error?

Create the variant again.

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.