An action that has been ordered into arbitration pursuant to Section 1141.11 or 1141.12 may not be ordered into mediation under this title, and an action that has been ordered into mediation pursuant to Section 1775.3 may not be ordered into arbitration pursuant to Section 1141.11.
Source:
Section 1775.4, https://leginfo.legislature.ca.gov/faces/codes_displaySection.xhtml?lawCode=CCP§ionNum=1775.4..