How to call one report to another?

Here ZREP2 CALLS report ZREP1 when you click on output of report ZREP2.

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REPORT ZREP1.

parameter : paramet(18) type c.

write : paramet. 

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REPORT ZREP2 NO STANDARD PAGE HEADING.
tables: qals.

RANGES seltab for qals-prueflos.

WRITE: 'Select a Selection!',
/ '--------------------'.
SKIP.

FORMAT HOTSPOT COLOR 5 INVERSE ON.
WRITE: 'Selection 1',
/ 'Selection 2'.

AT LINE-SELECTION.
CASE SY-LILLI.
WHEN 4.
SUBMIT zrep1 VIA SELECTION-SCREEN
WITH PARAMET EQ 'Selection 1'
WITH SELECTO IN SELTAB
WITH SELECTO NE 3
AND RETURN.
WHEN 5.
 

SUBMIT zrep1 VIA SELECTION-SCREEN
WITH PARAMET EQ 'Selection 1'

AND RETURN.
ENDCASE.