IFS Cloud22R2: MWO Mod - Failed to find procedure error

Hi All,

I am working on a MWO Mod.
I defined a function in ServiceEngApp-Cust.projection and implemented the function in ServiceEngApp-Cust.offline file.
---------------------------- FUNCTION PROCEDURES ----------------------------
procedure Function<GetNextSlNumber> Number {

Code compiles without any error.
However, when I test the Mod in the app, I get following error.
Action<ActionName>:Failed to find procedure ‘GetNextSlNumber’

Action and function GetNextSlNumber are implemented in the same file  ServiceEngApp-Cust.offline.
Any clues as to why I get this error?