how to un-Register , RESIGSTERED item in AX2012

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                User have created “Inventory Movement Journals” to add opening balance of Inventory, and against these Movement Journals they have entered Item Arrival to register Batch # and Serial #. Below is the process

1.      Create Movement Journal    Inventory...Transactions.........Movement

2.      Register Items (Batch # & Serial #) Item Arrival à Item Arrival

3.      Post Item Movement

There are few transaction where Item Arrival is posted (step 2) but Movement is not posted (step 3) and we want to delete these transaction. System displays error message “Updating has been interrupted because there is an inventory transaction with the status Registered.” So, we have to un-register these items first to delete transaction.

Any idea??