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The ability to make an export (Geojson) of all (Water system) buildings where an error and / or warning is generated. This makes it possible to check them in GIS and make corrections to the source data immediately. For Example: A weir that has the same level at the top and bottom. When this error is exported, it is quite easy to change the water level limit to the correct level.
More info:
https://previewsupport.tygron.com/wiki/Object_flow_output_(Water_Overlay)