Index: trunk/core/units/general/cat_dbitem.php
===================================================================
diff -u -r2095 -r2262
--- trunk/core/units/general/cat_dbitem.php	(.../cat_dbitem.php)	(revision 2095)
+++ trunk/core/units/general/cat_dbitem.php	(.../cat_dbitem.php)	(revision 2262)
@@ -109,6 +109,12 @@
 		return $ret;
 	}
 	
+	/**
+	 * Deletes item from categories
+	 *
+	 * @param Array $delete_category_ids
+	 * @author Alex
+	 */
 	function DeleteFromCategories($delete_category_ids)
 	{
 		$id_field = $this->Application->getUnitOption($this->Prefix, 'IDField'); // because item was loaded before by ResourceId
@@ -137,7 +143,7 @@
 			$primary_cat_id = $this->Conn->GetCol( sprintf($sql, $ci_table, $resource_id) );
 			if( count($primary_cat_id) == 0 )
 			{
-				$sql = 'REPLACE INTO %s (CategoryId,ItemResourceId,PrimaryCat) VALUES (%s,%s,1)';
+				$sql = 'UPDATE %s SET PrimaryCat = 1 WHERE (CategoryId = %s) AND (ItemResourceId = %s)';
 				$this->Conn->Query( sprintf($sql, $ci_table, reset($cats_left), $resource_id ) );
 			}
 		}
Index: trunk/kernel/units/general/cat_dbitem.php
===================================================================
diff -u -r2095 -r2262
--- trunk/kernel/units/general/cat_dbitem.php	(.../cat_dbitem.php)	(revision 2095)
+++ trunk/kernel/units/general/cat_dbitem.php	(.../cat_dbitem.php)	(revision 2262)
@@ -109,6 +109,12 @@
 		return $ret;
 	}
 	
+	/**
+	 * Deletes item from categories
+	 *
+	 * @param Array $delete_category_ids
+	 * @author Alex
+	 */
 	function DeleteFromCategories($delete_category_ids)
 	{
 		$id_field = $this->Application->getUnitOption($this->Prefix, 'IDField'); // because item was loaded before by ResourceId
@@ -137,7 +143,7 @@
 			$primary_cat_id = $this->Conn->GetCol( sprintf($sql, $ci_table, $resource_id) );
 			if( count($primary_cat_id) == 0 )
 			{
-				$sql = 'REPLACE INTO %s (CategoryId,ItemResourceId,PrimaryCat) VALUES (%s,%s,1)';
+				$sql = 'UPDATE %s SET PrimaryCat = 1 WHERE (CategoryId = %s) AND (ItemResourceId = %s)';
 				$this->Conn->Query( sprintf($sql, $ci_table, reset($cats_left), $resource_id ) );
 			}
 		}