Can we develop new transactions for RF terminals?

Yes. Custom transactions may be developed using the ABAP workbench and accessed using SAPConsole. The major issues to be conscious of when writing your own transactions consist of simple rules of screen design, allowing your GUI screens to translate smoothly to an RF terminal screen.

The trick is to program Dialog programs and not do BDC recordings. Come time for upgrade you will redo most if not all of the recorded transactions!

There are also some finer subtleties in programming for RF. For one thing, handheld devices cannot support error, warning and information messages. You need to write your own function module to trap these errors and translate it to something that the device can handle. If you poke around inside the SAP supplied RF transactions, you will learn a few tricks.

For more information you can go to a search engine such as Google and search with the keyword "SAPConsole". There are a lot of good sites listed on this search engine. There is even a site where you can request a White Paper on SAPConsole.