diff -uNr old/sc/source/core/data/dpobject.cxx new/sc/source/core/data/dpobject.cxx
--- old/sc/source/core/data/dpobject.cxx	2009-04-29 15:34:51.359375000 +0800
+++ new/sc/source/core/data/dpobject.cxx	2009-04-29 16:49:42.828125000 +0800
@@ -349,8 +349,12 @@
 		if ( bAllowMove && nHeaderRows != nOldRows )
 		{
 			long nDiff = nOldRows - nHeaderRows;
+			if( nDiff < 0 )
+			    nDiff = 0;
+
 			if ( nOldRows == 0 )
-				--nDiff;
+			    if( nDiff > 0 )
+			        --nDiff;
 			if ( nHeaderRows == 0 )
 				++nDiff;