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(event["fld038"] > (trans["Amount"] - trans["Amount"]*eventAmountDiscrepancyInPercent/100)
and
event["fld038"] < (trans["Amount"] + trans["Amount"]*eventAmountDiscrepancyInPercent/100))
and
(event["fld038"] == trans["Transact_row"] and trans["Transact_row"] != None)
or
(event["fld038"] == '' and  trans["Transact_row"] == None)
and
(event["fld037"] == trans["Ref_number"] and trans["Ref_number"] != None)
or
(event["fld037"] == '' and trans["Ref_number"] == None)
and
(event["fld037"] == trans["Msg_type"][0:2] and trans["Msg_type"] != None)
or
(event["fld037"] == '' and trans["Msg_type"] == None)
and
event["fld026"] == trans["MCC_code"]