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I done the very same thing a few months back. I used arcpy but the script is far too long to post here so I will give you an outline of what I did. I used a spatial join to detect which points/nodes were within a particular line feature. Because the spatial join does not take flow direction into account I used arcpy to ascertain which was the start point ...


Sometimes it is better not to use out of the box solution. This is why I suggest Populate X an Y fields in node layer, convert them to integers, say cm. Create string field and populate it by concatenating string represantations of integers. Do similar thing in links table for first point in the shape. Join nodes table to links using latest created fields ...

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