Currently you cannot access neither the Field "Required Attendees" of the Entry "Appointment", which has the Field Type PartyList, nor the data structure "Activity Party" where this information is saved.

The PowerShell Cmd New-NavCrmTable don't create fields of Field Type PartyList.
You can create a CRM/CDS Table for "Activity Party", but Business Central gets an error if you open that table: The 'Retrieve' method does not support entities of type 'activityparty'.

It would be nice if you could read or write this PartyLists that from Business Central.
Needs Votes
Ideas Administrator

Thank you for this suggestion! Currently this is not on our roadmap. We are tracking this idea and if it gathers more votes and comments we will consider it in the future.

Best regards,
Business Central Team