What is the scope of an employee's employment when he goes on an errand?

"If the employee is not simply on his way from his home to his normal place of work or returning from said place to his home for his own purpose, but is coming from his home or returning to it on a special errand either as part of his regular duties or at a specific order or request of his employer, the employee is considered to be in the scope of his employment from the time that he starts on the errand until he has returned or until he deviates therefrom for personal reasons." (Boynton v. McKales (1956) 139 Cal.App.2d 777, 789, 294 P.2d 733.)