Some suggestions (I don't reaaly know the real problem).

      if ( $drc::file1[$i] =~ /VIOLATION/ ) {
         $violation = getViolation ( $drc::file1[$i] ) ;
         if ( $drc::flag ) { $drc::rpt1{$moduleName}{$netName}{$gate}{
+"Transitio         else         { $drc::rpt2{$moduleName}{$netName}{$
+gate}{"Transition"} =      }                                         
+# End of IF Statement
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Try to check if the assignment is really executed (place a breakpoint with the debugger, or add a warn statement). Maybe the conditions never stand, so you get no data in the hash.

Also here: for ( $i = 0 ; $i <= $#drc::file1 - 1 ; $i++ ) you're not iterating through the last line, is that on purpose? Remove the  - 1 if it was accidental.