What is the ruling if a worshipper intentionally ('Amdan) omits a necessary act (Wajib) during prayer?

Prostration of Forgetfulness (سجود السهو): Core Rules

• They can rectify it by performing Sujud al-Sahw.
• Sujud al-Sahw cannot rectify intentional omission; the omission is sinful and the prayer must be repeated.
• They must fast for three days.
• They must perform charity.