Hello PhaniKumar !
1.If release strategies are configured with agent details, the above rule will fetch the agents. No need to customize the rule. Check the rule whether it returns agents from SPRO transaction.
2.If agent details are to be maintained in SPRO transaction, maintain "1" in workflow column.
3.Test the standard workflow.
4. Based on ERNAM field in EKKO table, identify the initiator and develop the logic to determine the approval levels.
5.Whether the purchase order is released or not can be seen in the FRGRL field of EKKO table. In workflow log, additional details can be obtained.
Regards,
S.Suresh.