I'm just breeding my bravery stock randomly and stumbled across this bug- Glass Craze has a breeding minimum requirement of E for bravery, which I didn't realize when I threw him at this P bravery mare I have.

So now when I try to use that embryo, I get this message.

I'm having a similar issue where it won't let me use the embryo I created with this match because the stallion HAD (he is dead now, so I really cannot fix this) a minimum requirement of World Class.

So now I'm stuck with two embryos that it let me create, but won't let me use.

I do suspect that the dead stallion's minimum requirements being upheld may be a separate bug, but I wanted to put that here anyways just in case.