
I started with the object opportunity, Start the process is "when a record is created or edited". Scheduled actions are "0 Hours After Opportunity is Last Modified Date". The Required field "Post to Chatter under Scheduled actions is "Action Name" equals Required field, "Post to" This Record" and Message says Sample ship date is required for "Proposal price/quote and "Contract Pending/Verbal Award".
Thanks for any help you can provide.