Hey @hafsteinnbg, thank you for posting in our Community!
You could Implement validation checks within your pipeline stages to ensure that the ‘HQ Company ID’ is populated before allowing deals to progress to the closed won stage. This could involve manual verification by the sales team or automated checks using custom scripts.I would recommend connecting with HubSpot Technical Support, as Support is included in your subscription and they will be able to provide real time assistance for this matter, including hopping on a screenshare if necessary.
Kindly,
Pam