When does a new bank account become effective for Expense Payments

Summary:

We requested that an employee create new banking details and inactivate the old ones. Now we are getting an error that banking details are inactive, even though a new one was created in it's place.

Content (required):

We requested that an employee create new banking details and inactivate the old ones. Now we are getting an error that banking details are inactive, even though a new one was created in it's place and marked primary. Will the new account be applied if the expense report had previously been approved? Does it actually become effective the following day? Or is there something else we need to do?