Diagnosis
One of the following problems occurred:

• You attempted to determine a parameter group. However, for the current
element it was not yet defined which planning function the parametergroup belongs to. For this reason, the system cannot determine thepossible parameter groups.

• You attempted to set a reference to a selector for the attribute
"Function" but set a fixed value in advance for the parameter group.

Procedure
First determine the planning function and then the parameter group.
We recommend processing the attributes of an element in the order thatthey are listed in the attribute editor. In this way, you avoidproblems, which can arise from dependencies between the differentattributes.