Service on a commission on professional competence pursuant to Section 44944, in the employing school district or in some other district, by a person employed by a district in a position requiring certification qualifications shall not be considered time off job with respect to Section 45041. Neither the amount paid to a substitute required to be hired to replace such a person serving on a commission on professional competence pursuant to Section 44945 in the employing school district or in some other district nor the amount which would have been paid to a substitute had a substitute been employed, shall be deducted from the person’s salary pursuant to Section 45042.