Index: trunk/ippTools/src/magictool.c
===================================================================
--- trunk/ippTools/src/magictool.c	(revision 28516)
+++ trunk/ippTools/src/magictool.c	(revision 28765)
@@ -246,4 +246,5 @@
         psS64 diff_id = psMetadataLookupS64(NULL, row, "diff_id"); // difference identifier
         bool inverse = psMetadataLookupU64(NULL, row, "inverse"); // Inverse subtraction? Note types!
+        psString diff_data_group = psMetadataLookupStr(NULL, row, "diff_data_group");
 
         // create a new magicRun for this group
@@ -256,5 +257,5 @@
                                             "dirty",    // workdir_state
                                             label,
-                                            data_group ? data_group : label,
+                                            data_group ? data_group : (diff_data_group ? diff_data_group : label),
                                             dvodb,
                                             registered,