Vijay,
If you could have searched this forum you would have got the solution.
Okay here's some details which will help you out. I presume that you have done customizing for PO release strategy.
If not then follow this procedure:
http://help.sap.com/saphelp_47x200/helpdata/en/04/92761846f311d189470000e829fbbd/frameset.htm
Once you establish release strategy , event releasestepcreated will automatically created by system based on release codes.
so say for a standard po type (NB) you have defined two release codes I1 and I2 (based on certain amount- you can see this in class characterisitic using tcode CL02) and class type -032 and class PO_RELEASE most probably, check Char. tab).
Once you define char. in CL02, you gotta run tcode CT04, give the name of char. and fill all tab.
inside tab Addl data, you have to define CEKKO table and field too
this is where we have referenced the event releasestepcreated implicitly.
FOR all customizing of release strategy check this link , this is really great blog
http://www.sap123.com/forumdisplay.php?s=cced678eca43fe7a7e3bb9b83dc94022&f=2
then search for "setting up simple release procedure" thread in it.
It is for PR but parallel you can do for PO.
So if I1 release take place event will triggered, say A has approved I1 level and for whole PO release I2 is also required then one more time event releasestepcreated event would be triggered.
You can create workflow for PO release. Approver are determined based on rule AC20000027 (check in PFAC) which has user exit EXIT_SAPLEBNF_005 where you can write down your own code for approver determination.
Hope it will clarifies all your concerns
Cheers
Jai
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