Cyberware in Infected

[Ambush]

Hoi chummers! Creating an NPC to abuse,*ahem* I mean, -interact- with my players at a later point in the campaign. I created the character as normal, buying cyber, gear, etc. I then Infected the character. HL started telling me that the cyberware grade was invalid. The way that I read the rules, Deltaware would be fine anyways. I know that I can ignore the warning, but I was concerned about calculations being wrong because of the validation error. Is this a bug, or am I doing something wrong?