Add fields to an Oracle Mobile Screen

Hi All,

          I need to add the following fields:

- Production  Lot Number

- Packing List

- Invoice Number

to the Receipt screen in Oracle Mobile

Menu Function: INV_MOB_RCPT

HTML Call:        oracle.apps.inv.rcv.server.RcptGenFunction

My question is how to do this:

1) By Setup logged as WMS Administator (Load page or something like it)

2) By Java Class Customization (Coding)

I need to know if option 1) is applicable in this case to avoid customize Java Class.

Can anybody helpto face this request?

Thanks,

Diego