SAP Message 6A071 - No adjustment amount exists (condition type &, usage type &)

Diagnosis
You want to adjust a rent by entering different adjustment amounts onthe initial screen in accordance with the condition type and/or theexternal usage type of a rental unit.
The condition type &V1& for usage type &V2& is now to be adjusted.However, you have not specified a value for this purpose.

System Response
The adjustment cannot be carried out.

Procedure
If you want to carry out the adjustment, please enter an appropriatevalue on the initial screen.