Index: trunk/data/validator/combinations.mapcss
===================================================================
--- trunk/data/validator/combinations.mapcss	(revision 7937)
+++ trunk/data/validator/combinations.mapcss	(revision 7967)
@@ -108,4 +108,5 @@
 /* {0.tag} without {1.key} */
 *[aeroway=terminal][!building],
+*[power=generator][!generator:source],
 *[amenity=place_of_worship][!religion] {
   throwWarning: tr("{0} without {1}", "{0.tag}", "{1.key}");