I am experiencing a slightly different yet similar problem with the NextDownID. The entire field (i.e all records) are calculated as -1. I am trying to experimentally introduce "links" into the network (i.e. extra links inbetween confluence points, or non-confluence links) at the raster level. This seems to work upto the NextDownID generation process. My DrainageLines have TO_ and FROM_NODES and they do match up (i.e. the TO_NODE = the FROM NODE of the next downstream line). Is there any other conditions that might result in -1 being calulated for all DrainageLines?
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