Hi Jose
The downpayment processing in SD has a very specific design.
These notes describe the details.
213852 Analysis of down payment processing with FI
213567 Analysis of the down payments in SD
213526 Customizing of down payment processing SD/FI
213444 Advice note, down payment processing SD/FI
You MUST use the special indicator A as described from
transaction F-29 because posting via F-29 guarantees the field that link the
down payment to SD (VBEL2 and POSN2) are correctly filled in the reference FI tables (BSAD & BSID)
You can check this dependence in VF01 when you are creating a real invoice after
the down payment has been cleared. The function module SD_DOWNPAYMENT_READ will
pick up the cleared downpayment if it has been posted correctly and cleared. If
it is posted in any other way or transaction the link to the reference SD
document is lost (VBEL2 and POSN2) and the clearing item will not be brought into the new billing document as you have described above.
I hope this helps further
Kind regards
Brian