Calling a Oracle Function

Good morning guys!!!

I have a quick question. This is what I have to do:
I have to populated the Oracle Standard Who columns like :

in Oracle Cash Management using WM provided Cash Management routines. I am using the “BankStatementBizDoc” Document List provided by WM.

This is the following function in the package “fnd_global.user_id” in Oracle Financials thats needs to be mapped in WM so that I get the appropriate userid, lastupdate_date, last_update_login. Can any body tell me how I can implement this in WM. How do I call this function in a package in WM.

Thanks in advance for you help.