Index: kernel/db/cat_dbitem.php
===================================================================
--- kernel/db/cat_dbitem.php	(revision 15541)
+++ kernel/db/cat_dbitem.php	(working copy)
@@ -601,26 +601,21 @@
 	 */
 	protected function GetKeyClause($method = null, $keys_hash = null)
 	{
-		if ($method == 'load') {
+		if ( $method == 'load' && !isset($keys_hash) ) {
 			// for item with many categories makes primary to load
 			$ci_table = TABLE_PREFIX . 'CategoryItems';
 
-			if ($this->IsTempTable()) {
+			if ( $this->IsTempTable() ) {
 				$ci_table = $this->Application->GetTempName($ci_table, 'prefix:' . $this->Prefix);
 			}
 
-			$primary_category_clause = Array ('`' . $ci_table . '`.`PrimaryCat`' => 1);
-
-			if (!isset($keys_hash)) {
-				$keys_hash = Array ($this->IDField => $this->ID);
-			}
-
-			// merge primary category clause in any case to be sure, that
-			// CategoryId field will always contain primary category of item
-			$keys_hash = array_merge($keys_hash, $primary_category_clause);
+			// ensures, that CategoryId calculated field has primary category id in it
+			$keys_hash = Array (
+				$this->IDField => $this->ID,
+				'`' . $ci_table . '`.`PrimaryCat`' => 1
+			);
 		}
 
 		return parent::GetKeyClause($method, $keys_hash);
 	}
-
 }
\ No newline at end of file