Diagnosis
Caution!
The advance payments for this lease-out appear more than once in theindividual M3 records of the M/L-tape.
The reason for this is that multiple different time periods were definedwith settlement type 'advance payment' within one settlement period, forexample, during a change in settlement participation from 'advancepayment' to 'no participation' and then back to 'advance payment.'

Procedure
Check settlement participation in the lease-out.
If you really want these changes in settlement participation, then youhave to adjust the advance payment amounts in the M3 records for thelease-out manually.