how does /1BCDWB/DBEMRDETAIL gets generated?

How does /1BCDWB/DB* gets generated?

we have a requirement were we are created new TCODE " ZE16" a copy of SE16.

I am facing an issue when I am usings settings-->fields for selection, it is call the standard function module not the customised one.

when i have looked into the auto generated code /1BCDWB/DB* (Z/1BCDWB/DB* in my case) i found that its having the standard fm which gets called for settings-->fields for selection.

please let me know how can i include my customed fm instead of the standard one in the code "Z/1BCDWB/DB*"

thanks

Gaurav.