In Accounting for Nonprofits, a General ledger cash account could be defined on more than one bank record.

In The Financial Edge, an account code is used to define each cash account. The AP summary account, discount account, and encumbrance account can be used for only one bank.

For example, if the cash account for Bank One is 01-10000, then no other bank can use account code 10000 for it's cash account. If the cash accounts are shared between multiple banks, edit the bank account before converting from version 6 to version 7, or combine segments during the conversion process.