When you click Save, Sprwt checks (in this order):

• At least one customer is selected — otherwise "Please choose a user".
• Date is filled — "Empty Delivery Date".
• Due Date is filled — "Empty Due Date".
• Type (fulfillment type) is chosen — "Empty Event Type".
• For every type except Invoicing, and for Standard (not Personal Chef) proposals, Start Time and End Time are required — "Empty Event Start Time" / "Empty Event End Time".
• For Venues, the venue must be available (see the venue troubleshooting question).

The browser also enforces Name, Due Date, Net Days and Days Before Due Date for Email Reminders as required fields (via HTML required), and the address/pickup/venue fields become required depending on the chosen type.