Diagnosis
Scale type 'D' (interval scale) can only be chosen, if the conditiontype is provided with scale type 'D'.
This is however not the case.

System Response
The scale type 'D' (interval scale) can not be used.

Procedure
Please choose another scale type.
Technical program restrictions in the pricing area serve as abackground to this constraint.

Procedure for System Administration
If necessary, the Customizing settings should be changed.