AX 2012 SSRS ERROR : Could not find the identifier

Hi,

I wanted to add a new field to a report .so i added it in the tmp table for that report.

I created a copy of the report design and added the extra field with the dataset changed to the new RDP class.

On doing a buid I am getting the following errors.

Error 1:Validation Error

System.InvalidOperationException: Object is currently in use elsewhere.

   at Microsoft.VisualStudio.Modeling.GlobalEventManagerImpl.NotifyObservers(Object sender, EventArgs e)

   at Microsoft.VisualStudio.Modeling.ElementEventManagerImpl.NotifyObservers(Object sender, EventArgs e)

   at Microsoft.VisualStudio.Modeling.AddElementLinkCommand.NotifyObservers()

   at Microsoft.VisualStudio.Modeling.Transaction.Commit()

Error 2: This error is for all the fields.

Field token Fields!ItemReturnDeadLine.Value is invalid. Could not find the identifier

Also I have checked the dataset and its pointing to the new RDP class and the fields are also displayed in the Query Window.

Any Help highly APPRECIATED.

Thanks and Regards,

Vikas Mehta.