Index: branches/BNC_2.12/src/combination/bnccomb.cpp
===================================================================
--- branches/BNC_2.12/src/combination/bnccomb.cpp	(revision 8066)
+++ branches/BNC_2.12/src/combination/bnccomb.cpp	(revision 8176)
@@ -348,4 +348,13 @@
     }
 
+    if (
+        clkCorr._prn.system() == 'E' ||
+        clkCorr._prn.system() == 'C' ||
+        clkCorr._prn.system() == 'J' ||
+        clkCorr._prn.system() == 'I' ||
+        clkCorr._prn.system() == 'S' )   {
+      continue;
+    }
+    
     // Check Modulo Time
     // -----------------