The California ISO has revised the operating procedure referenced below.

5140 CAISO Market Participant Inquiries, version 4.0, effective June 1, 2019.

• Annual Review.
  • Updated the following sections to reflect current process:
    • Responsibilities section, and sections 2.1, 3.1, 3.2, 3.3.6 and 3.5
• Updated title from ISO Client Relations to ISO Customer Experience
• Replaced Reliability Messaging Tool (RMT) with Reliability Messaging System
• Changed "Interchange Scheduling" to "Transmission" or "Transmission Desk"
• Minor formatting and grammar updates
• Removed version history prior to five years

ISO Operating Procedures - http://www.caiso.com/rules/Pages/OperatingProcedures/Default.aspx