Diagnosis
The BAdI method returned an incorrect interval for the simulation. Thiscan have one of the following reasons:

• Billing documents already exist for the contract that is to be
simulated. The simulation period is not immediately after the last bi
lling period.
If the last billing run was a periodic billing run, the start date forsimulation must be earlier than or the same as the end date of thebilling period from the schedule record for the portion (ERCH-PTERMTDAT)+ 1 day.
If the last billing run was executed without a schedule record for theportion (for example, unplanned interim billing), the start date forsimulation must be earlier than or the same as the end of the billingperiod + 1 day.

• The start date for simulation is before the move-in date.


• You have only specified the start date or the end date for simulation.

System Response
The system cancels simulation.

Procedure
Check the BAdI implementation.