After deleting a setback max. value no more setback counts can be added

Current Situation

When creating a setback count for a job and after adding the max. value then delete the max. value. After this it is no longer possible to add a setback count.

Desired Behavior

When deleting the max. value of a setback it should still be possible to add entries to the setback.

Workaround

After logout/login it is possible again to add entries to the setback count.