Copy back of Prodution Error on Org Structure

Please can any of you guru's out there help.

We have just done a copyback from production to SR2 (QA system) and there is an error with the org structure.

We use extended Classic Scenrio and we replicate the org structure from ECQ to SRQ. (integrated)

All the org structure units appear when you search for them, but there is no link between any of the units, purchasing org units or groups.

The error we encounter when we try to to select one level up is the following:-

There are "no objects superior to the current start object" .

Please can you advise if you have ever come across this type of problem or any possible solution.

Thanks in advance

Sharon