The notation used in relation diagrams:
“[Table Name] Field Name - one to many - Field Name [Table Name]”
is confusing, because the relation is expressed in terms of the table but the field names are closest on either side of the relation.
Consider a different notation to better distinguish between the table and field name, and more obviously state the relation between tables.
Example: Tables “Items” and “Subitems” with a field Items.Subitems 1:many with Subitems is currently displayed as:
[Items] Subitems - has many - Items [Subitems]
This reads as Subitems has maniy Items, which is incorrect. Consider instead: