Is the violation referring to the pipe or the "structure"? Are you using "null structures"?
Though some use Pipes for water plans, this is not the actual intention of the product. I find that
the old method of using an offset, splined polyline is more effective for waterlines. You'll
realize why when you have to deal with a "crossing" at storm or sanitary pipes... water pipes in the
field are pretty flexible and cover and clearance are controls, not inverts to maintain flow. By
using Pipes for waterlines your adding drawing overhead, complexity and problems.
Happy Modeling,
JD