[Koha] Koha patron card number length

[Mark Ehle]

Hello, Folks -

I am a Computer Tech for a public library in Michigan. We are looking  
at Koha as a possible replacement for our aging Dynix system.

I have Koha running in a VMware virtual machine, running on Ubuntu  
Server 7.04. The install was not at all easy, but what do you want for  
free, eh?

When I tried to add a user, the first thing Koha told me is that the  
card number was "Invalid cardnumber". We use a 14-digit codabar  
barcoded patron library card system. An example is "23330001535735".  
It is crucial that we be able to keep this intact, otherwise we will  
not be able to even consider Koha.

Is there a way to modify this? Where is the documentation that talks  
about such things?

Thanks very much,

Mark