162
162
if sub_tree_id == self.get_root_id():
163
163
raise errors.BadReferenceTarget(self, sub_tree,
164
164
'Trees have the same root id.')
166
166
raise errors.BadReferenceTarget(self, sub_tree,
167
167
'Root id already present in tree')
168
168
self._add([sub_tree_path], [sub_tree_id], ['tree-reference'])