detaching entity and then attaching it to another manager

I'm trying to do following:

 

1. Create entity and attach it to EntityManager. I do attach it to manager ONLY for the reason that I need verification to work. VerificationManager can't be assigned to detached entity.

 

this.MailItem = new SYSMailItem
                {
                    MailItemGKey = Guid.NewGuid(),
                    SenderKey = (this.SecurityService.User as UserPrincipal).UserKey
                };
this.EntityManager.AddEntity(this.MailItem); 

 

2. When I'm done with editing entity - I need to pass it into my "manager" to save it.

 

this.EntityManager.RemoveEntity(this.MailItem, true);
this.MailService.SendMail(this.MailItem...

 

3. Inside MailService I'm trying to attach this entity back to another manager for saving:

 

this.entityManager.AddEntity(mailItem);

I'm getting following error:

This entity already belongs to or was previously associated with another EntityManager and has a temporary key defined by that EntityManager

 

Yes, sure. I agree with this message :)

But how do I detach so it can be attached to different manager?