Creating Client Company user duplicates companies in Books

Creating Client Company user duplicates companies in Books

I have only just realised why I'm seeing two entries for some of my customers in Books - when I add them as a Client Company in Project, it seems to create a new customer account in Books. This is obviously a problem when the Customer already exists in Books.

This makes me think I may have setup the integration wrong between Projects and Books (in truth, I can't remember setting it up at all).

Is there a way to tell Projects to pick Client Companies from Books?
Or a way to stop it creating duplicate entries in Books?

Many thanks

Steve