Purchase Order items not receipted

Hi,

We have had a PO not properly update with receipting.

We receipted in 4 items, then 1 item at a later date & then 1 item to complete the receipting for a PO (total of 6 Items). All these items have been costed and invoiced, however the first 4 items dont seem to have been acknowledged as receipted in the PO.

I was wondering if this has happened to anyone else and if they knew why it may have occured.
I am also wondering if it is best to force the PO closed as the job has been completed.