The problem with enchanting, mending or renaming the bow with an anvil.

What I expected was ...:
 I wanted to enchant one bow with the help of another on the anvil.
What really happened:
Under the third cell appeared the inscription: "too expensive."
Steps to play:
1. I enchanted a bow.
2. Then I enchanted another bow. The other one was broken and he had another brew.
3. I fixed the first bow with the second bow with the help of the anvil.
4. Under the third cell appeared the inscription: "too expensive."