Diagnosis
No suitable exercise contingents could be found for the higher-levelforce element. This can be due to several reasons:
The higher-level force element is not an exercise, nor does it have anyrelationships to an exercise.
The higher-level force element is an exercise, but all the contingentsof this exercise are in the past, which means that newrelationships cannot be created for these contingents.
The higher-level force element has exercise relationships, but theseare all in the past, which means that new relationships cannotbe created with reference to this contingent.

System Response
Since exercise relationships must always have a reference tocontingents or exercise relationships of the higher-level force element,no exercise relationship can be created in this case between the twoforce elements selected.