I have a requirement to read and Edit an offline Interactive form using ABAP Program (No WebDynpro). Also how to enable and disable a section in the form

Hello SK,

first your write your functionality into a function module(RFC) then you create it as web service from the SE37 only. and later open it from SOAMANAGER tcode then create a End Point for the service and later. use the WSDL code in SFP tcode then create a offline interactive form.

Thanks and Regards
Sudhakar