Github user nitin-maharana commented on the pull request: https://github.com/apache/cloudstack/pull/823#issuecomment-152453158 I tested this with this scenario. There are three service offerings. { "listserviceofferingsresponse": { "count": 3, "serviceoffering": [ { "id": "7482d1bb-9acb-4688-b448-d7bd7f70916a", "name": "CO-z", "displaytext": "CO-z", "cpunumber": 1, "cpuspeed": 64, "memory": 64, "created": "2014-05-08T17:02:54+0530", "storagetype": "shared", "offerha": false, "limitcpuuse": false, "isvolatile": false, "tags": "z", "issystem": false, "defaultuse": false, "iscustomized": false }, { "id": "d9ae1945-ff42-43d3-bddd-3ec54ea49bbf", "name": "To_Error", "displaytext": "To_Error", "cpunumber": 4, "cpuspeed": 4, "memory": 256, "created": "2014-05-26T12:14:25+0530", "storagetype": "shared", "offerha": false, "limitcpuuse": false, "isvolatile": false, "tags": "anusha", "issystem": false, "defaultuse": false, "iscustomized": false }, { "id": "a0ffbdf4-861c-4de2-a353-852a870281e5", "name": "MultiTagOffering", "displaytext": "MultiTagOffering", "cpunumber": 1, "cpuspeed": 64, "memory": 64, "created": "2014-05-28T16:10:55+0530", "storagetype": "shared", "offerha": false, "limitcpuuse": false, "isvolatile": false, "tags": "anusha,z", "issystem": false, "defaultuse": false, "iscustomized": false } ] } } Now, VM's current service offering name is "To_Error", which has tag named "anusha". When I upgrade the service offering to "CO-z". I get the below error. SS attached.  But we can upgrade from "To_Error" to "MultiTagOffering". As "MultiTagOffering" contains tags "anusha" and some extra tags.
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