* needed blueprint *

There is a problem with the blueprint and the journal :
when I open the Journal, chose a blueprint, and click on "use blueprint" at the right bottom, a message appears in the journal: * needed blueprint *
Yet I have blueprints in my inventory

No. I have understand. I had allowed the same key to the journal and drop item, them when il open ther journal (J key), the blueprint drop on the ground ....
I change my setting and that's allright.....