How to prevent multiple suppliers from using same bankbranch-accountnumber-currency ?

Hello

On 12.1.3

we had supplier X who had a site level bank assignment of a particular bankbranch-accountnumber-currency . The bank account assignment had an end date in the past. i.e inactive .

if we tried to assign the same bankbranch-accountnumber-currency to another supplier Y , then we would get error message 'The external Bank Account already exists',

which is correct.

After we migrated to 12.2,

if we tried to assign the same bankbranch-accountnumber-currency to another supplier Y, we are allowed to save that assignment. we don't get the error message, which is incorrect.

so the bankbranch-accountnumber-currency combination on the migrated supplier X is ignored. unlike in 12.1.3