SAP Message 60975 - Enter a date of 1st debit pos. which is before rental end &

Diagnosis
The date of the first debit position is the date from when thecondition amounts are to be paid. This date must be within the rentalperiod. In this case, however, the payment start date is after therental end date.

Procedure
Enter a date for the first debit position that is before the rental enddate.