role of rp-provide-from-last & rp-provide-from-frst macros

Hi,

I have the following code :

******************************************************************************

REPORT  ZPYRLL01

Tables: PERNR.
Infotypes: 0002.

GET PERNR.
*rp-provide-from-last p0002 space pn-begda pn-endda.
*rp-provide-from-frst p0002 space pn-begda pn-endda.

WRITE: / 'Pernr ' , PERNR-PERNR , sy-vline ,
              'Pernr-Ename ' , (15) PERNR-ENAME , sy-vline ,
              'First Name ' , (8) p0002-VORNA , sy-vline ,
              'p0002-begda ' , (10) p0002-begda , sy-vline ,
              'p0002-endda ' , (10) p0002-endda , sy-vline ,
              'pn-begda ' , (10) pn-begda , sy-vline ,
              'pn-endda ' , (10) pn-endda.

******************************************************************************

I have tested it without both macros, with only the first macro and with only the second one.

And in the three trials I got the same results ?

(List of Personnel ranked by ascending pernrs)

So,

Q1 : What is the role of these two macros ?

Their presence or abscence change nothing in the result when processing.

Another Q :

If the GET PERNR statement beside filling ITs with data, do a loop.

Q2 : Then what is the role of Loop & Provide loops ?

We can replace WHEN & BETWEEN statement with an IF.