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I need some help regarding adi , plz send some good material or some sourse to get the information

hi
we can raise one ivoice for more then one po , but conditon is supplier shd be same,
2. as transportation is ours (assuming we r responsible for goods damazed) we need to pay for 10 items

i am unable to view outputs for some requests submitted in srs window.. i am getting msg ...this file does not create any output?? particularly for the reports like payables open interface, expense invoice import.. do we need to set some thing in system admin thanks
regards
yugesh