This feature is part of the Multi-Currency Add-On, which is an additional module for Big Business that supports transactions in foreign currencies.
This Solution lists additional features and information for the Multi-Currency Add-On. (6226)
the option to Delete a Customer with History and Move To another Customer Card is not available for foreign-currency Customer Cards.
the option to Delete a Vendor with History and Move To another Vendor Card is not available for foreign-currency Vendor Cards.
Activity locks the Foreign checkbox on Customer Cards