It sounds like you have a customization on your system. No base system handlers or attributes will start with AFI_. Chances are the subroutine is doing the check for wait time and then it sets the attribute to be used in attendant. It is probably not this simple however as a basic wait time lookup can be done right from attendant so whoever customized the system probably has other logic within the handler. You are going to have to find the handler, open it in designer, and figure out what its doing.