Change Picking data, then call Delivery Note and Invoice in the background

Question

I have designed a GUI where the picking data (from table LIPS) is changed.  Now my SD consultant wants the program, when a SAVE or CONTINUE button is clicked, to do the Delivery Note and Invoice in the background.
To quote:
Your progrm must change the values in the delivery in txn VL02n, when the delivery is saved it updates LIKP and LIPS amongst othr tables. When the invoice / billing doc is created it is done with ref to the delivery. Billing doc created using txn VF01, the main tables of the billing doc are VBRK (header) and VBRP (item).  And for completion sake, tables VBAK and VBAP are the sales order tables!
In my PAI module, how do I do the calling of these two functions?
The consultant suggested I use a BDC. Why can't I use Call Transaction.... ?   What is the best way to do this?
At the moment, my SAVE button updates an internal table of LIPS, and for test purposes it exits to List Processing to test if the amounts changed correctly.
Hope someone can help.

Answer 1

Hi
Ok.
Do you mean "Accual GI Date" in Item overview ?
I have performed a test. When I check "Goods Issue delivery" indeed it has posting date in the past.
Now for the invoice:
I set
"Billing date"
"Serv. rendered" date
and "Prining date" in the past.
Would it be enough to post everything in the last month ?
regards
Rafal