in R11.5.10 how to automate allocations from one legal entity to another using AR receivable txn and

in R11.5.10, how can we automate a process that charges intercompany allocations from sub A Accts Receivable to Sub B, and gets paid from Sub B AP?

This must be a common practice in larger companies with allocations charged from corporate to the subsidiary.
1. sub A creates an AR intercompany receivable invoice for sub B
2. sub B create an AP intercompany invoice for sub A
3. sub B creates a payment for subsidiary A
3. Sub A applies cash directly to the Sub B invoice in AR
 This also should also result in a more accurate Cash Positioning report.