Diagnosis
The assignment for object &v1&, employee &v2& and activity type &v3& isgrouped with other assignments, but contains a different skill, which isnot allowed.
In Forecasting, assignments for the same resource and object combinationare grouped when they differ only in the value of the serviceattributes,which are customized as key fields and are not relevant for forecasting.

System Response
The assignment cannot be saved.

Procedure
Change the skill for the assignment.