Income account error when trying to generate Invoice from Patient Appointment

I am getting the following error when trying to Save the Patient Appointment in Healthcare module:

Error: Sales Invoice Item Row #1: Value missing for: Income Account

The “Default Income Account” property of that Item is setup with a valid account from the chart.

What I am trying to do is to create the Invoice directly from the New Patient Appointment form, as documented.

Thank you!

Installed Apps
ERPNext: v12.0.4 (version-12)
Frappe Framework: v12.0.4 (version-12)

Problem disappeared the next day. Probably the “Default Income Account” property of the item was not refreshed immediately.