Enhancement IQSM0001 Automatic serial number assignment

Hi,

I have used enhancement IQSM0001, function module EXIT_SAPLIPW1_001 for the automatic serial allocation in delivery which is working fine; but the same enhamcement is not working for return delivery.

After investigation; i found that this enhancement only works with delivery document category 'J' which is delivery and not with 'T' which i used for return delivery.

Any idea guys?

Thanks