Help me resolve my terrible relationship with Ref columns 😩

[TedM]

I know this should be easy but for some reason I keep messing it up!

My scenario:
Two tables - Quotes and RAMS both with a single row per record.  A Quote would usually be associated with only one RAMS .... but occasionally there might be two or three.

A Quote is created first and has, amongst other fields a Quote No. field that is Text - this is unique to each row:

The Quotes table also has the virtual Related RAMSs field:

The RAMS table also has a Quote No. field which is a Ref with the Quotes table as the source:

If I create a RAMS row with the same Quote No. as a row in the Quotes table - why does the Related RAMSs field stay empty?