Index: trunk/MagicSoft/Mars/datacenter/db/builddatasets.php
===================================================================
--- trunk/MagicSoft/Mars/datacenter/db/builddatasets.php	(revision 9562)
+++ trunk/MagicSoft/Mars/datacenter/db/builddatasets.php	(revision 9570)
@@ -689,5 +689,6 @@
                                 $doubleseq++;
                         }
-                        if ($obskey!=$_SESSION["obsmode"])
+                        //$obskey >1 makes sure that fObservationMode is not N/A (old data)
+                        if ($obskey!=$_SESSION["obsmode"] && $obskey>1)
                         {
                             printf("<li style='color:%s'>%s: You have a mistake in your observation mode. </li>\n",