You can install a VS extension which allows you to build the ERD diagrams. This should allow you the flexibility to always find the relationships you are looking for.
SalesTable belongs to the Sales and Marketing Module.
The Sales and Marketing module handles all sales order processing, from order creation to invoicing, and SalesTable plays a central role in this process.
SalesTable and SalesLine belongs to Sales and Marketing module indeed.
It might be a small data mistake in the ERD, so my advise is to reach out to Alex Meyer Directly.
I don't think Alex maintains his ERD page anymore (It's made for AX2012 R2), so some information might be out of date or not compatible with D365 F&O.
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