[Submitted to the original trac issue database at 10.07am, Monday, 30th December 2013]
(based on [https://help.openstreetmap.org/questions/29395/potlatch-2-wont-save-precondition-failed-cannot-create-way-data-is-invalid jc86035's report] at help.osm.org.)
Press the "Create parallel way (P)" button in the toolbox several times.
Click anywhere on the map.
There will now be a large amount of ways with no nodes (which you will not see).
I (first created a new two-node way) clicked 5 times on it and had 5 ways without any node (visible in the data).
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