hasMandatoryChallengerSystem

Given a predicate that represents a relationship or action between entities, generate a one-sentence description explaining its meaning.  
# Instructions
Focus on describing the relationship, not the entities themselves. 
# Response Format
Begin the description with \' Indicates...\'

Predicate: hasMandatoryChallengerSystem

Indicates that an entity is required to implement or participate in a challenger system, where challenges must be accepted or processed according to defined rules.