Define the graduated scales in the condition type

What causes this issue?

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

System Response

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

How to fix this error?

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

Procedure for System Administrators

If necessary, the Customizing settings should be changed.

Error message extract from SAP system. Copyright SAP SE.