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When executing the EVENTLINES LAYER command to display line events, the command returns the error:
Error drawing event lines
The event table contains zero length events where the FROM_ITEM measure value is equal to the TO_ITEM measure value.
Query the event table to find line events where FROM_ITEM = TO_ITEM.
Zero length event records can then either be deleted or edited so that the FROM_ITEM and TO_ITEM measure values are not the same.