Bod won't accept items

[Ponch16]

transmuted a bod today its a 10 exceptional long sword and for some reason when i try to add the item to it it will not accept the item. I've transmuted countless bods and fill them and have not had this occur.

[Thane ir'Wyndan]

There are two types of longswords, the normal design and a thin pointy one with an orange handle.  The one you have requires the long thin pointy sword design and those cannot be crafted.