soPrincipalExists

I got a problem installing Specops Inventory / Specops Reporting at a cutomer today. Debug Log and Eventlog was comaplaining about soPrincipalExists. This is the exact error message in Eventlog;

System.InvalidOperationException: The stored procedure 'soPrincipalExists' doesn't exist.
   at System.Data.SqlClient.SqlCommand.DeriveParameters()
   at System.Data.SqlClient.SqlCommandBuilder.DeriveParameters(SqlCommand command)
   at SpecopsSoft.Data.SqlHelperParameterCache.DiscoverSpParameterSet(String connectionString, String spName, Boolean includeReturnValueParameter)
   at SpecopsSoft.Data.SqlHelperParameterCache.GetSpParameterSet(String connectionString, String spName, Boolean includeReturnValueParameter)
   at SpecopsSoft.SpecopsInventory.Server.SpecopsInventoryDbAccess.PrincipalExists(SqlTransaction transaction, Guid guid, Int32& principalId)
   at SpecopsSoft.SpecopsInventory.Server.SpecopsInventoryServerWorker.UpdateDatabase(SqlTransaction transaction, Guid principalGuid, String principalName, Boolean isComputerPrincipal, XmlDocument doc, DateTime executionTime)
   at SpecopsSoft.SpecopsInventory.Server.SpecopsInventoryServerWorker.ProcessInventoryResult(String xml)

The solution is to check Permissions in the SQL Server. I had to remove and grant dbOwner access to the Specops Inventory Service Account for Specops3 Database.

Restarted the service and problem solved.