The system's help for the various requirement categories defines a Variable Requirement in the following way:
"The requirement is variable and is dynamically broken down into other requirements based on the individual conditions."
This definition can have various meanings, at least to my mind. However, if I had to guess, based on what I have seen of the audit functionality, I would guess that a Variable Requirement performs a logical inclusive-OR of the requirement results under it - just as a Consolidation performs a logical AND of the requirement results under it. Is this correct, or am I making a wishful, but incorrect, guess?