Except as set forth in Section 11146.4, each filer shall attend the orientation course required in Section 11146.1, as follows:
(a) For a filer who holds a position with the agency on January 1, 2003, not later than December 31, 2003 and, thereafter, at least once during each consecutive period of two calendar years commencing on January 1, 2005.
(b) For a person who becomes a filer with the agency after January 1, 2003, within six months after he or she becomes a filer and at least once during each consecutive period of two calendar years commencing on the first odd-numbered year thereafter.