Hi All,
Thanks for all of your responses.
I am able to resolve my issue with small piece of code in 'DO_VIEW_INIT_ON_ACTIVATION' method.
Seems like standard code is triggered and setting the selection mode to 'SelectSingle' and cleared my 'Selection_tab' values as well when I navigate back from service request detailed page to result list.
Hence there are inconsistency in 'Selection_tab' internal table values and Selection mode and thus no entries are selected from result list.
I redefined the 'DO_VIEW_INIT_ON_ACTIVATION', call the super class method and again pass the local impl ZXXXX_CN00 reference to standard impl CXXX_CN00.
Suggestions are most Welcome,if you have work-around!!