When we try to add same bank account information to second supplier like normal bank account setup we get the error message as shown in below screenshot
Step 1: Find the supplier for whom the bank account already assigned
i)Click On the left panel go to Company Profile -> Banking Details
ii) Select an existing one and click on Update icon.Go to the Account Owners section (should be in the bottom of the page). Click on Add Another Row and add other suppliers that you would like to use the same bank account.
Step 2:
i) Go to other suppliers, Banking Details section