in Teiid 9.0 it would be useful to create a bidirectional link between tables, like in odata2

for example:

<EntityType Name="Product">
<Key>
<PropertyRef Name="ProductID"/>
</Key>
<Property Name="ProductID" Type="Edm.Int32" Nullable="false" p5:StoreGeneratedPattern="Identity"/>
<Property Name="ProductName" Type="Edm.String" Nullable="false" MaxLength="40"/>
<Property Name="SupplierID" Type="Edm.Int32"/>
<Property Name="CategoryID" Type="Edm.Int32"/>
<Property Name="QuantityPerUnit" Type="Edm.String" MaxLength="20"/>
<Property Name="UnitPrice" Type="Edm.Decimal" Precision="19" Scale="4"/>
<Property Name="UnitsInStock" Type="Edm.Int16"/>
<Property Name="UnitsOnOrder" Type="Edm.Int16"/><Property Name="ReorderLevel" Type="Edm.Int16"/>

<Property Name="Discontinued" Type="Edm.Boolean" Nullable="false"/>
<NavigationProperty Name="Category" Type="NorthwindModel.Category" Partner="Products">
<ReferentialConstraint Property="CategoryID" ReferencedProperty="CategoryID"/>
</NavigationProperty>
<NavigationProperty Name="Order_Details" Type="Collection(NorthwindModel.Order_Detail)" Partner="Product"/>
<NavigationProperty Name="Supplier" Type="NorthwindModel.Supplier" Partner="Products">
<ReferentialConstraint Property="SupplierID" ReferencedProperty="SupplierID"/>
</NavigationProperty>
</EntityType>

<EntityType Name="Category">
<Key>
<PropertyRef Name="CategoryID"/>
</Key>
<Property Name="CategoryID" Type="Edm.Int32" Nullable="false" p5:StoreGeneratedPattern="Identity"/>
<Property Name="CategoryName" Type="Edm.String" Nullable="false" MaxLength="15"/>
<Property Name="Description" Type="Edm.String" MaxLength="max"/>
<Property Name="Picture" Type="Edm.Binary" MaxLength="max"/>
<NavigationProperty Name="Products" Type="Collection(NorthwindModel.Product)" Partner="Category"/>
</EntityType>

It seems that the two tables are related through NavigationProperty and Partner
In fact I can see all the Categories of a certain Product

http://services.odata.org/V4/Northwind/Northwind.svc/Products(10)/Category

or viceversa the products of a certain Category

http://services.odata.org/V4/Northwind/Northwind.svc/Categories(8)/Products

While in Teiid using odata2 this works just by creating a FK from one table to the other one, with odata4 this does not happen