Customer Number field for Customers

Customers to have a unique customer code. This will enable customer list to match better with other systems. For instance, I run accounts for a scout group. The association already has allocated each scouting member a unique member code. I want to have my customer list match so I can easily make comparisons. If ReckonOne ever gets to a standard where it allows excel imprt of invoices then I could easily download billing information from the membership database and link using the customer code. This would make the process quicker and less error prone.