Meaning: The Sketch 3D path, the trench run slope, or the invert elevation values are causing the trench feature elevation to be a negative value.
Recovery:
Modify the path
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In the Workspace Explorer, select the trench run that is in error.
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Click Path .
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Modify the Sketch 3D path so that each knuckle edge is a positive elevation value.
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Click Finish on the path ribbon, and then click Finish on the command ribbon.
-OR-
Modify the slope or elevation values
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In the Workspace Explorer, select the trench run that is in error.
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Click Properties .
The Trench Run Properties dialog box displays.
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On the General tab, select Dimensions in the Category box.
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Modify the elevation and slope values so that the start elevation is a positive value and the elevation remains positive along the run.
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Click OK.
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Click Finish on the command ribbon.