Make sure to include a precedence clause in the specifications.
You should define which documents or sections take precedence. That way if there are errors or conflicts, one will take precedent.
Don’t put detail of the same work in more than one place. It is better to not repeat the same information but a precedence clause should still be put in place.
As the project manager, you should also be aware of the precedence in documents you have received from the client.