Bank account number lenght needs to be increse from 18 to 22

Hi All,

Before posting above subject requirement, I have searched in SCN. People suggested as:

1. Give it as 18 digit account in "Bank account number place" and rest maintain in reference field.

2. Try to change in OY17: I tried in this t.code not possible.

3. you can concatenate two fields into one.

I am not able to solve my problem with the above suggestion.

Kindly provide step by step details to reach my requirement.

Thanks & regards,

Mariks