Change Client code format

Hi guys,

I have the following issue.

Clients have client codes like "115", "1" ,etc. I would like it to be something like if business name is dlonra. DLON01

Reason is customers use client code or invoice number as their reference upon payment via EFT and this causes some confusion and extra work for billing team on our side to verify which client it is for.

Any ideas on a way to better handle this or a better way to format the client codes?