Using the Authoring console in System Center 2012 Service Manager to extend the class from a UNIX management pack to an unsealed management pack, when you try to add a new property you get the following error message:
This can occur if a management pack public key token is specified for an unsealed management pack. For example, you will find an entry similar to the following in the XML file for the management pack:
Category ID="RHI.UNIXComputer.CI.ClassExtension.Category" Value="Console!Microsoft.EnterpriseManagement.ServiceManager.ManagementPack"> <ManagementPackName>RHI.UNIXComputer.CI.ClassExtension</ManagementPackName> <ManagementPackVersion>188.8.131.52</ManagementPackVersion> <ManagementPackPublicKeyToken>2abcXyz2d6760a2b</ManagementPackPublicKeyToken>
When the authoring tool tries to validate the management pack XML file, the process fails because the management pack is not sealed, thus we cannot add a new property successfully.