Hi Gerd 2 more thoughts: For elements from Polish input, set a distinct role. This can be spotted early and either the order rule or direction rule can be applied (they are closed, so the area/direction can be calculated immediately). This then allowed OSM data with a blank role to be handled as suggested earlier. The error reporting is not good - it can generate many lines in the log. An idea would be to have: Element lists for each way-like problem. Counts or flags for other problems. etc and, for each problem detected, add all the ways in JoinedWays, increase appropriate count, set the flag etc. At the end, if any of these are populated, output the Relation and then, if full diagnostics, each populated problem type followed by lists of wayIds on same line etc. Ticker