Financial Modules implementation

Hello All,

I have two different issues which I want to resolve and want to know what the best process would be.

# New Implementation

# Release 12.1.3

# One Company from SAP to EBS

# 2 other Companies from different legacy systems to EBS

# Only Financial modules being implemented.

# Requirements have been gathered from 2 Co's and Gap analyzed.

# The Co. with SAP is behind and so the opinion is to get into General Ledger directly.

Now there are two questions.

Q 1) If only Financial modules are being implemented in AP how to make payment without matching the receipt, without knowing the material or services have been received, how to handle the return of goods. Similarly in AR - how to handle the same situation. also, another aspect is the invoices in AP and Transactions in AR - whether they should be keyed in manually or they should be brought in through the standard API for AP and Auto Invoice for AR. Is there a better way to handle this in terms of Application Integration Architecture, SOA or BPEL etc?