SD0031: Identifies records that violate the condition [Start Date/Time of Observation or Start Relative to Reference Period is not null], limited to records where [End Date/Time of Observation or End Relative to Reference Period is not null]"
The rows that are provoking it look typically like:
cmstdtc
cmendtc 2004-10-11/2005-04-12
cmstrtpt BEFORE
cmenrtpt
cmsttpt 2003-10-23 10:15:33
cmentpt
So basically we have an definite end date/time (as an interval) but the start is relative to a time point. If the end date/time is also relative to a time point, e.g.