This order contains an inactive item.

SUGGESTED

Hi All

I have a couple of old PO's that I want to cancel.
However both are saying that I can't cancel or alter them as they contain an inactive item. 
However they don't! I have checked line by line and every item is a current active one. 
The supplier is an active one. 


It's a tad ironic as I actually want to flag one of the items as inactive, but can't while there is an an outstanding order for it on Sage. 
I have done a Sage data check and there appears to be no problems with our data. 

Any ideas?