Product Receipt Item not listed during Purchase Order Invoice Creation

Dear All,

I want to asked advice,

I had purchase order 575, item removable has been receipt, 

then I creating purchase order invoice from AP, All Purchase Order, search PO 575, go to Invoice tab and click invoice,

default qty for lines : setted to product receipt qty as usual we had,

but the item not listed.

please help, why the item not showed up.

Thank you