Index: trunk/core/kernel/db/db_tag_processor.php
===================================================================
diff -u -r2427 -r2505
--- trunk/core/kernel/db/db_tag_processor.php	(.../db_tag_processor.php)	(revision 2427)
+++ trunk/core/kernel/db/db_tag_processor.php	(.../db_tag_processor.php)	(revision 2505)
@@ -500,6 +500,18 @@
 			}
 			$value = $object->GetField($field, $format);
 			
+			if( $this->SelectParam($params, 'negative') )
+			{
+				if(strpos($value, '-') === 0)
+				{
+					$value = substr($value, 1);
+				}
+				else 
+				{
+					$value = '-'.$value;
+				}
+			}
+			
 			if( $this->HasParam($params, 'currency') )
 			{
 				$value = $this->AddCurrencySymbol($value, $iso);