Movement Type 122 Reversal - Movement Type 123

Hello,

I have several Movement Type 122's from 2011 that need to be reversed. When I go to MIGO / Cancelation / Material Document and bring up one of the documents, the item shows on the screen, but the OK button is not available for selection to perform the 123 Reversal.

What does this mean about the 122's? That they can't be reversed? I have a situation where the Qty Invoiced is higher than the Qty Delivered for an item and am trying to clean it up.

If there's a better to address this situation - I'm open to suggestions.

Please advise.

Thanks in Advance!