Index: applications/editors/josm/plugins/reltoolbox/src/relcontext/actions/CreateMultipolygonAction.java
===================================================================
--- applications/editors/josm/plugins/reltoolbox/src/relcontext/actions/CreateMultipolygonAction.java	(revision 30197)
+++ applications/editors/josm/plugins/reltoolbox/src/relcontext/actions/CreateMultipolygonAction.java	(revision 30209)
@@ -31,5 +31,5 @@
 	super("Multi", "data/multipolygon", tr("Create a multipolygon from selected objects"),
 		Shortcut.registerShortcut("reltoolbox:multipolygon", tr("Relation Toolbox: {0}", tr("Create multipolygon")),
-		KeyEvent.VK_B, Shortcut.CTRL), false);
+		KeyEvent.VK_A, Shortcut.ALT_CTRL), false);
 	this.chRel = chRel;
 	updateEnabledState();