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Make sure whatever equipment these branch lines are serving has its connector set to in. It hard to tell without seeing your file but it looks as though the branches are being told to push GPM back onto the system. If there is nothing on the branches it might have to have some sort of family on it to force the system to subtract at each branch.
nate
Nathan Chapman
Production Manager at General Heating and Air Conditioning
Revit Architecture Certified Professional
Revit MEP Mechanical Certified Professional
Revit MEP Electrical Certified Professional
DynaFabrication Package Author
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