Configured line printed twice on Invoice of a Ship direct order

Hi,

We have a typical problem happening since Tuesday. For a ship direct order involving configured items on the order lines, the line is printed twice on the invoice. However, the total on the invoice is correct as the total is not considering the duplicate lines. This is happening for only one combination, that is - Ship Direct orders + Configured items on it.

There have been no changes made on the instance off late. Also, we checked the rdf and code on the instance cloned on 28 Oct 2012 which are matching to the ones on Production instance. The invoices are printing correctly on the cloned instance but not on Production.