Certain legal entities are not visible in Proc Contracts due to mandatory primary ledger on the BU

When assigning project accounting to a business unit the primary ledger is mandatory. We have GBP/EUR/USD primary ledgers which are associated to a single procurement business unit (BU). The primary ledgers are linked with different legal entities. This is meaning the legal entities associated to the selected primary ledger are visible in procurement contracts, and those linked with the other primary ledgers not visible.

Is there a way of either not selecting the primary ledger or enabling all the legal entities.

Many thanks,

Adam