Function module - delta extractor

Question

I have created a function module, it is pretty much based on RSAX_BIW_GET_DATA_SIMPLE.
I have gone through a lot of forum threads and this is what gathered from those.
This is what I did. Created a FM, Created generic datasource in RSO2, delta field is TIMESTMP. As per some of the posts it says delts field will be read automatically by SAPI in FM and passed in I_T_SELECT so I have writtten below code
     LOOP AT i_t_select INTO l_s_select WHERE fieldnm = 'TIMESTMP'.
        MOVE-CORRESPONDING l_s_select TO L_R_TIMESTMP.
        APPEND L_R_TIMESTMP.
      ENDLOOP.
It is not showing up any value L_R_TIMESTMP in when tested in RSA3, also in infopackage load I get 0 records. As mentioned in the posts roosgendlm table is populated but it is not read anywhere in FM.
Delta Init worked fine but Delta is not working.
Any help will be appreciated.

Answer 1

In the function yuo can see this line:
Maximum number of lines for DB table
  STATICS: s_s_if TYPE srsc_s_if_simple,
try to change loop like this
LOOP AT s_s_if-t_select INTO l_s_select WHERE fieldnm = 'TIMESTMP'.
Mario