Hi Madhu,
we don't use the multi level approver functionality and I don't entirely understand whether you are using the OVS Searchhelps or whether the approvers are polled entirely automatic in your business scenario, but just to make sure you don't miss anything, you might want to check BADI PT_GEN_REQ Methods IF_EX_PT_GEN_REQ~SEARCH_FOR_NEXT_PROCESSOR and IF_EX_PT_GEN_REQ~FILTER_NEXT_PROCESSOR as an alternative to SIMULATE_VIA_BLOP in PT_ABS_REQ.
Cheers, Lukas