Problem for Goods Receipt for Subcontracting Purchase Order

Question

Dear all,
Presently, we are using SAP version 4.6C and we need to introduce GR for
Subcontracting Purchase Order. We have developed a ABAP program to handle
subcon Goods Receipt by uploading flat-files from our subcontractor. The
scenario is as follows :
Goods Receipt for Subcontracting Purchase Order
1. In the ABAP program, function BAPI_GOODSMVT_CREATE will be used for goods
movement.
2. Data provided to the function are as follows :
- Posting date
- Document date
- Material number
- Plant
- Storage location
- Batch
- Movement type (101)
- Quantity
- Purchase order number
- Purchase order item
- Movement indicator (B - Goods receipt for purchase order)
3. The function will do data verification and automatically determine GI
item for subcon stock:
- Movement type (543)
- Special stock (O - parts prov. vendor)
- Material
- Quantity
- Plant
Our problem is that :
Only the GR item in the interface is to be transferred and the GI item is
determined by the system. So, the quantity for subcon stock cannot be
changed using this BAPI. Then the system will continue processing the goods
receipt and create material document.
Manually, by using transaction code MIGO, the user can display the subcon
stock data and then change the quantity.
By using transaction code MB01, after the user fills in all the GR fields,
the system comes to line item 002 (subcon stock data) and then quantity can
be changed.
As per user requirement, quantity for GI item must be same with the quantity
that has been transferred to subcon vendor in Delivery for Subcon
(transaction code VL02N).
We cannot achieve this requirement by using the BAPI mentioned above. Would
appreciate any valuable help from anyone who is able to help us on this
matter. Are there any other BAPI's that can help us to achieve the same
result ?
Thank you in advance and best regards.

Answer 1

As far as i understood the problem I suggest u to create the
BDC according to user actions that are performed in he manual
operation.
I can't say that the BAPI performs the exac solution what you want.
I have done some BDC work using MB01 and suggest you to be careful
and try to keep the complete in the logic as some chages in rows in BDC will
change the complete scenario.And throw correct quantity val in correct
material
row.
This methodology will help u even in mass uploads.
Or in case of automation u can perform the call transaction BDC in
background mode.
so As per my understanding bdc program is the solution. pls try and let me
know.