A service button allow more than one ITM mapped to it. My assumption is that, the original path still exists but you are then assigning a new itm. This would produce the warning your getting. I'm away from my computer for a while so cant test this out. Run it on a button and see if you see multiple paths to itms.
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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