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Master groups in reservoir coupling have no wells in the master reservoir (they represent slave groups), so their GCW (Group Controlled Wells) count was 0. This caused them to be incorrectly excluded from: - Guide rate distribution (FractionCalculator) - Local reduction level calculations - Target constraint checking Fix: Set GCW = 1 for RC master groups by convention. This is consistent with how GCW is used throughout the code - only the condition GCW > 0 matters, not the actual count.