title: DATABASE - tables connection
body: <p><a href="https://i.stack.imgur.com/bvvJD.png" rel="nofollow noreferrer">TABLES</a></p>
  <p>I have this DB where the product have a PART NUMBER and that PN has many conditions (New, Overhauled, Used, Repairable) and that same PN + CONDITION can be stored at several boxes and the same box can have other PN. I´ve made the tables (link at the beginning)
  I'm having problems with defining the PK of BOX-STORAGE and how to connect them so I can insert data on both table.</p>