LSMW, CREMAS04, and updating Partner Functions

Question

I am involved with converting legacy data into SAP. To populate the SAP Vendor Master correctly will involve 3 passes using LSMW:
Pass #1: use IDOC CREMAS04 and populate the majority of master record fields
Pass #2: use BAPI: Business Object "BUS4001"; Method "SAVEREPLICA"; Message Type "ADRMAS"; Basic Type "ADRMAS03" to update Vendor record address data.
Pass #3: use IDOC CREMAS04 and update Head Office, Alternate Payee, and related Partner Function data.
The problem I am having is best explained using the following example:
When a vendor record (ex: Vendor Number 300004) is first created, the following 3 Partner Functions are also created automatically to reference the same vendor number: OA, VN, & PI (Ordering Address, Vendor, & Invoicing Party):
OA    Ordering Address    300004   Vendor A
VN    Vendor                   300004   Vendor A
PI      Invoicing Party        300004   Vendor A
This particular vendor is actually one of many "plants" or "warehouses" of a larger vendor, and I need to configure the record to reflect that the Purchase Orders go to the Parent Vendor (Head office) and that the Invoice comes from the same source. Therefore, I need to remove or edit the existing OA and PI partner functions so that I only end up with the same 3 Partner Functions, but the linked vendor record for partner functions OA and PI needs to be that of Head Office.
Example: if using Vendor Number 300005 "Head Office Vendor"
OA    Ordering Address    300005   Vendor A
VN    Vendor                   300004   Vendor A
PI      Invoicing Party        300005   Vendor A
What I am actually seeing when I post the IDOC is the following:
OA    Ordering Address    300004   Vendor A
OA    Ordering Address    300005   Vendor A
VN    Vendor                   300004   Vendor A
PI      Invoicing Party        300004   Vendor A
PI      Invoicing Party        300005   Vendor A
Can anyone shed some light on this?

Answer 1

Don,
I am trying to work with the same data that you discussed in this thread.  Can you send me some additional details on your Pass #2?  I was successful in Pass #1, particularly in adding new PI vendors when necessary and deleting the existing internally created PI vendors.  But I'm stuck on Pass #2 where I want to add the extended address information that you mention using the SAVEREPLICA BAPI.  I can certainly use the recording method, but would like to leverage the power of the BAPI approach.
Thanks in advance!
Wes