When clicking the 'Link existing record' button on a subpanel, I want to prompt for a value *before* saving the link. The value is a required field for child accounts, but not for standalone accounts.
I can't put the condition in a logic hook, because the field is also not required if the account is updated via external systems via the API, only from the UI.
I need the user to make a selection from a dropdown list before the link actually gets created.
How do I do this?