Purchase Order Distributions - Why is the Expense AP Accrual Account Different in 11.5.9 vs. 11.5.10

We have only been on Oracle 11.5.10 for 4 weeks now, but there is an irregularity between the purchase order expense AP accrual account in 11.5.9 versus 11.5.10.

For all PO's cut before the upgrade (in 11.5.9), the PO expense AP accrual account used the company code of the org the PO is cut for (Ex. Org = SGP, Company Code = 35). For all PO's cut in 11.5.10, the PO expense AP accrual account uses our standard company code (Company Code 50) no matter what org the PO is cut for (Ex. Org = SGP, Company Code = 50).

Can someone please provide me some insight as to why this is?

Thanks,