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Alexander Vysotskiy
CEO of Vysotskiy consulting | BIM trainer | University lecturer
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The "no auto route" message is usually an indication that Revit can't work out the relationship between elements properly. This is often lack of space between elements for a fitting, insufficient elevation offset between elements or one type specifying a fitting while another doesn't specify or it is incompatible. Assuming the element types are configured correctly and they are the same element types my money is on insufficient space between elements to create a specified fitting.