Change for OVPMS-1490 Add selling units to service products

git-svn-id: svn://svn.openvpms.org/openvpms/archetypes/trunk@6010 9e4fa352-aafb-0310-9071-df624684024b
pepare for release

git-svn-id: svn://svn.openvpms.org/openvpms/archetypes/trunk@6022 9e4fa352-aafb-0310-9071-df624684024b