The rigid piping styles allow only the 90-degree, and 45-degree angles (when 45-degree is allowed in the style) and the combined angles of 135-degrees. When Parallel With Edge or Perpendicular To Face is applied, bends are automatically created where an odd angle is required.
When an odd angle exists between the two joint pipe segments, violations occur. Use Bend to create a bend so that the route is valid.
You can manually define the bends using Custom Bend. It is applied before you create the next segment.