I have the following problem:

I have 4 forms (Supplier, Product, Quotation, Order)

Supplier has a bidirectional link to Product (One Supplier, Many Products)

Product has a bidirectional link to Quotation (One Product, Many Quotations)

And now I am working on the bidirectional link between Quotations and Orders (One quotation, Many Orders)

But I'm stuck, I want a subform in my Order Form because it allows users to create an Order including several Quotations

I can create the lookup field in the subform and link it to Quotation ID

But I cannot enable BIDIRECTIONAL function

What did I miss?

Shall I create first a separate FORM in order to enable lookup bidirectional between Quotation ID and Order ID

And then add this form as subform in my Order Form?

Thanks in advance for your help