How do I create a cross-reference (Xref) table in JCB?

[dformdotdk]

Hi

I need to create a cross-reference (Xref) table with 2 foreign keys. Simplified example would be a member with a subscription. The xref table would contain all the invoices with a foreign key (FK) to the member and the subscription.

JCB doesn't have an out of the box field for FK's? or a simple way of creating those relations?

[dformdotdk]

I think I can answer that my self, with a link to this video: https://www.youtube.com/watch?v=91iIAuHZj38
Also the "countries" package contains an example for those who are looking for one as well.