When running a migration job (object migration) in ConfigMgr 2012 it's possible that the following errors are displayed in MIGMCTRL.LOG.
"SMS provider doesn't have read, write or delete permission to the package source path"
"Failed to get the image property from the source WIM file due to error 80070005"
"SMS_TaskSequencePackage.PackageID='' was skipped with: One of its dependency objects failed to migrate"
All errors has a specific reason: Permissions!
Just make sure that the Computeraccount holding the SMS Provider role has Local Administrator permissions on the ConfigMgr 2007/2012 server. After that errors are gone and the migration job will complete.
To change the Package Source locations use this tool:
Coretech Package Source Changer