I want to learn how to create customer exit, I went through the documents available online but have few questions.
1. what is e_t_range where we are storing our result and why it's needed , is it called somewhere?
2. I found many thread which declare below in customer exit codes.
l_s_range type RSR_S_RANGESID
what does it mean and what its 3 values signifies low, sign and opt ? is it some kind of work area?
3. wha is difference in istep 1 and istep 2 basically. I know one is called before variable screen and other one after that. I just want to know the situation where it is used and how we can conclude that in this situation we should use 1 or 2 ?
Could you please help to answer these questions.