How to add a requirement for Calls and Meetings Guests list to include at least one Contacts

Our Sales Director is wanting to ensure that the Sales team members always add the contact(s) they talked with during a recorded Call or Meeting. 

If a Call or Meeting is created from the Accounts Module the Assigned User is auto-assigned as one of the guests, and this is enough for them to be allowed to save the record, but we want to make sure that at least one contact is added to the Guestlist. 

Can a requirement for a linked Contact be made via Studio or modifying the Guestlist logic?

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