No &1 exists for this trip to either start work or return from work

What causes this issue?

You want to change a trip to start work or a trip to return from work.
However, a related <(>&<)>V1<(>&<)> does not exist (anymore). The data
is inconsistent.

System Response

This business trip cannot be changed.

How to fix this error?

If no related <(>&<)>V1<(>&<)> exists, you can only delete the trip to
start work (or return from work), or you need to change the trip schema
so that this is no longer a trip to start work or to return from work.

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.