[web2py] New validator or..

[Kenneth Lundström]

I´m trying to create a form where user enters a reference number from 
bills. I have three criterias:

IS_EMPTY_OR
IS_NOT_IN_DB
this two works great, but to check that user hasn´t done a mistaken when 
inputting the reference code I´d like to check that the reference code 
checkbit is correct.

Do I have to create a new validator to acheive this. I guess I can´t do 
this after if form.accepts?


Kenneth