The Engineering item revision - production files form displays the production file that is linked to the engineering item selected on the Engineering items form. If the engineering item was created with the Create engineering item process, and it was linked to a production file during this process, the production file linked will automatically be displayed on the Engineering item revision - production files form. The link between the production file and the engineering item is also created automatically when synchronizing engineering items with engineering BOM items with order code 'Produce in new production file'.
If the engineering item was created on the Engineering items form, however, you need to manually create the link with the production file on the Engineering item revision - production files form.