I’ve searched high and low and just can’t get my head around page includes.

Can someone please assist?

I am building an opportunity page. 

I have a custom object called FactFind and have created a model for that object.

Both models are working fine.

I have created a tab on my opportunity page and want to display a page include for the related FactFind record in that tab. The FactFind record Id should be referenced from the Opportunity Object in the lookup field “MortgageFactFind”.

It’s not working and I suspect I’m missing something in my query string:

I’ve tried a million things nothing works. I’m obviously missing something vital. If someone can point me in the right direction that would be great.

Thank you

Erin