Calculation type 'Flat Amount times Multiplier' in Values defined by criteria

Summary:

Has anyone used the calculation type 'Flat Amount times Multiplier' in Values defined by criteria? Can you please suggest what is the default calculation type that needs to be used

Content (please ensure you mask any confidential information):

Trying to use the calculation type 'Flat Amount times Multiplier' in Values defined by criteria. The requirement is to multiply a flat amount by the working hours of the employee and given it as an allowance. I am using the multiplier 'work hours'. Can someone please suggest how to use this calculation type? On choosing the salary basis there is an error saying that the VDC should return a flat amount. Working hours is a DBI on the person assignment which is used as a Multiplier.