HI,
please check with the your abaper how it is takeing long time while runnning
take some reocrds in FM and execute it and same records test it in RSA3 and find the time.
how many records have in full load if huge volume of records give the filter creteria.
debug the data soruce at RSA3 help with the abaper.
if is the FDM_COLL_INVOICE_BW standard FM we can't change the FM.
Thanks,
Phani.