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There are some inconsistencies at reply of "/hosts" method at
http://www.parallels.com/pa/pa-core-services/host-management/1 resource, some nodes do not have aps.id property. The issue is caused by the bug with id #POA-111047 (""host-management" returns several nodes without "aps.id" property").
Ready to provide option (switch from "ready to provide" to "not ready to provide" and back) for the nodes that were added to OA before OSA 7.0.