Answer Posted / mouse

http://sap.ittoolbox.com/groups/technical-functional/sap-
dev/difference-between-setleave-and-call-screen-commands-
395437
&
also see this.
With SET SCREEN the current screen simply specifies the next
screen in the chain , control branches to this next screen
as sonn as th e current screen has been processed .Return
from next screen to current screen is not automatic .It does
not interrupt processing of the current screen.If we want to
branch to the next screen without finishing the current one
,use LEAVE SCREEN.
- With CALL SCREEN , the current (calling) chain is
suspended , and a next screen (screen chain) is called .The
called can then return to the suspended chain with the
statement LEAVE SCREEN TO SCREEN 0 .Sometime we might want
to let an user call a pop up screen from the main
application screen to let him enter secondary
information.After they have completed their enteries, the
users should be able to close the popup and return directly
to the place where they left off in the main screen.Here
comes CALL SCREEN into picture .This statement lets us
insert such a sequence intp the current one.
If we use SET SCREEN without LEAVE SCREEN, the program
finishes processing for the current screen before branching
to <scr no>. If we use LEAVE SCREEN without a SET SCREEN
before it, the current screen process will be terminated and
branch directly to the screen specified as the default next-
screen in the screen attributes.
-
LEAVE TO SCREEN 0 or (SET SCREEN 0 and LEAVE SCREEN) .When u
return to the suspended chain execution resumes with the
statement directly following the original CALL SCREEN
statement.The original sequence of screens in a transaction
(that is , without having stacked any additional call
modes),you returned from the transaction altogether.
LEAVE TO SCREEN 0 or (SET SCREEN 0 and LEAVE SCREEN) .When u
return to the suspended chain execution resumes with the
statement directly following the original CALL SCREEN
statement.The original sequence of screens in a transaction
(that is , without having stacked any additional call
modes),you returned from the transaction altogether

Thankyou.

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