diff --git a/core/model/DataObject.php b/core/model/DataObject.php
index 34f50b051..2ecf69ef6 100644
--- a/core/model/DataObject.php
+++ b/core/model/DataObject.php
@@ -387,93 +387,6 @@ class DataObject extends Controller {
 		return true;
 	}
 	
-	/**
-	 * Merges data and relations from another object of same class,
-	 * without conflict resolution. Allows to specify which
-	 * dataset takes priority in case its not empty.
-	 * has_one-relations are just transferred with priority 'right'.
-	 * has_many and many_many-relations are added regardless of priority.
-	 * 
-	 * Caution: has_many/many_many relations are moved rather than duplicated,
-	 * meaning they are not connected to the merged object any longer.
-	 * Caution: Just saves updated has_many/many_many relations to the database,
-	 * doesn't write the updated object itself (just writes the object-properties). 
-	 * Caution: Does not delete the merged object.
-	 * Caution: Does now overwrite Created date on the original object.
-	 * 
-	 * @param $obj DataObject
-	 * @param $priority String left|right Determines who wins in case of a conflict (optional)
-	 * @param $includeRelations Boolean Merge any existing relations (optional)
-	 * @param $overwriteWithEmpty Boolean Overwrite existing left values with empty right values. 
-	 * 	Only applicable with $priority='right'. (optional)
-	 * @return Boolean
-	 */
-	public function merge($rightObj, $priority = 'right', $includeRelations = true, $overwriteWithEmpty = false) {
-		$leftObj = $this;
-		
-		if($leftObj->ClassName != $rightObj->ClassName) {
-			// we can't merge similiar subclasses because they might have additional relations
-			user_error("DataObject->merge(): Invalid object class '{$rightObj->ClassName}' 
-				(expected '{$leftObj->ClassName}').", E_USER_WARNING);
-			return false;
-		}
-
-		if(!$rightObj->ID) {
-			user_error("DataObject->merge(): Please write your merged-in object to the database before merging, 
-				to make sure all relations are transferred properly.').", E_USER_WARNING);
-			return false;
-		}
-		
-		// makes sure we don't merge data like ID or ClassName
-		$leftData = $leftObj->customDatabaseFields();
-		$rightData = $rightObj->customDatabaseFields();
-		
-		foreach($rightData as $key=>$rightVal) {
-			// don't merge conflicting values if priority is 'left'
-			if($priority == 'left' && $leftObj->{$key} !== $rightObj->{$key}) continue;
-			
-			// don't overwrite existing left values with empty right values (if $overwriteWithEmpty is set)
-			if($priority == 'right' && !$overwriteWithEmpty && empty($rightObj->{$key})) continue;
-
-			// TODO remove redundant merge of has_one fields
-			$leftObj->{$key} = $rightObj->{$key};
-		}
-		
-		// merge relations
-		if($includeRelations) {
-			if($manyMany = $this->many_many()) {
-				foreach($manyMany as $relationship => $class) {
-					$leftComponents = $leftObj->getManyManyComponents($relationship);
-					$rightComponents = $rightObj->getManyManyComponents($relationship);
-					if($rightComponents && $rightComponents->exists()) $leftComponents->addMany($rightComponents->column('ID'));
-					$leftComponents->write();
-				}
-			}
-
-			if($hasMany = $this->has_many()) {
-				foreach($hasMany as $relationship => $class) {
-					$leftComponents = $leftObj->getComponents($relationship);
-					$rightComponents = $rightObj->getComponents($relationship);
-					if($rightComponents && $rightComponents->exists()) $leftComponents->addMany($rightComponents->column('ID'));
-					$leftComponents->write();
-				}
-	
-			}
-
-			if($hasOne = $this->has_one()) {
-				foreach($hasOne as $relationship => $class) {
-					$leftComponent = $leftObj->getComponent($relationship);
-					$rightComponent = $rightObj->getComponent($relationship);
-					if($leftComponent->exists() && $rightComponent->exists() && $priority == 'right') {
-						$leftObj->{$relationship . 'ID'} = $rightObj->{$relationship . 'ID'};
-					}
-				}
-			}
-		}
-		
-		return true;
-	}
-	
 	/**
 	 * Forces the record to think that all its data has changed.
 	 * Doesn't write to the database.