Some ABAP Questions?

Question

Can anyone give the answers to the following questions?
1. Can u tell me the sequence to triggering of INITIALIZATION , AT SELECTION-SCREEN, AT SELECTION-SCREEN OUTPUT & 
AT SELECTION-SCREEN on field.
2. WHT is the diffrence between the two selection-screen of LDB PNP?
3. Wht is SIGNATURE in BADI implementation?
4. How to get the footer at the end of page when the output is only 10 records, where as there are 100 lines declared for output?

Answer 1

Hi
1.
1. Initialization
2. At selection-screen output
3. At selection-screen
4. At selection-screen on <field>
5. Start-of-selection
6. End-of-selection
7. Top-of-page
8. End-of-page
9. At pf<key>  “Interactive reporting”
10.At line-selection  “Interactive reporting”
11.At user-command “Interactive reporting”
12.Top-of-page during line selection “I reporting”
2. The selection screens are different for allowing different selection criterien.
u can check the link http://www.planetsap.com/HR_ABAP_LDB.htm
3. Not sure
4. check this.
you can give the line count for the output in the report as follows(example):
REPORT  Z_REPORT001 MESSAGE-ID Z_MSG1 NO STANDARD PAGE HEADING LINE-SIZE
255 <b>LINE-COUNT 65(3).</b>
here lines are 65 and out of which 3 are for header and footer.
and u can give the header and footer in Top-of-Page and End-of-Page.
Regards
Asha