I am sorry that I don't have any relevant document to support my statement.However, based on my limited VFR experience, ATC will ask an aircraft to report at your filed turning points. E.g. You filed a VFR flt plan from SZB-KUA and Bt Caves, Bentong Town, Temerloh Town, Maran and Gambang are the filed turning points (EET included in the flt plan). ATC will ask you to report at these turning points with a standard 'position report' call.
ATC may ask an aircraft to report at any other point as well when necessary.
The Unlearned 