Looking for Lawson API Listing

I am just getting back into development and actually had a listing that included all API's along with inputs and outputs as well as a definition of what it does.  I not longer have that and wanted to see if anyone has anything like that.  I am working on a user exit for PA52 and all the fields from the screen are actually Alpha and I need to convert them to numeric to compute something. 

Any help is appreciated.

Thanks,
Carrie Schoonover