vt7 dev release: Add Module from a related List Button doesn't automatically populate the reference field

I have some custom vtlib created modules which have a UI10 reference field linking them to the Quotes module.

In version 6, if I go to the related list for one of my modules in a Quote record and click the "Add MyModule" button, the UI10 field in the target module is populated with the crmid of this Quote.

With the exact same code, in the vt7 dev version, this does not happen. The target UI10 field remains empty.