customer’s bank account number was too long

Hello All,

We have scenario where we can not enter customer while account number completely in bank account number filed , can you please guide how to do this or instead of this filed can we use IBAN filed ?

We have 24 digit bank account number for customer , so how we can deal with this please guide. -Bank account number for example is like 123456789123456789123456 ( 24 digit)

Thanks,

Mayank