SAP Message UPF096 - Variable &1 is not restricted to a single value

Diagnosis
You tried to execute a formula function with a parameter group, inwhich the variable &V1& is referred to. However, this variable is notrestricted to a single value, rather it contains several values orvalue areas.

System Response
The function cannot be executed. The data records contained in theplanning package remain unchanged.

Procedure
Check the definition of variable &V1& in the context of the currentplanning area and make sure, that the variable is restricted to exactlyone single value. If you do not want to change the definition of thevariable, then create a new variable, which is restricted to a singlevalue, and alter the parameter group of the formula correspondingly.