I've got a supplier that has just completed a merger and will be changing names (ABC-->XYZ).  I'd like to rename the BP and consolidate the AP balances.  The BP merging utility looks to only allow this if there is no history going back to prior closed periods.

Old BP: ABC   ABC, Inc. (history since 2012)

New BP: XYZ   XYZ, Inc. (effective, September 1st, 2015)

Any suggestions?