Do not use CriteriaFieldIndex methods. Use packFieldIndexes instead.
IMPORTANT: For variable incentive criteria use only. Do NOT use for action steps - use packFieldIndexes instead.
Packs two field indices into a single uint8 value for criteria tuple access. Both indices must be between 0-13 to fit in the packed format.
Uses an offset of 32 to avoid collision with normal field indices (which are 0-31), allowing the system to distinguish between direct field access and tuple access.
A tuple of [firstIndex, secondIndex]