private List<Int64> getWorkingCopyTupleIds(DatasetVersion datasetVersion)
{
// effective tuples of the working copy are similar to latest checked in version. They are in DataTuples table but they belong to the latest and previous versions
List<Int64> versionIds = getPreviousVersionIds(datasetVersion);
List<Int64> tuples = (versionIds == null || versionIds.Count() <= 0) ?
new List<Int64>() :
DataTupleRepo
.Query(p => versionIds.Contains(((DataTuple)p).DatasetVersion.Id))
.Select(p => p.Id)
.ToList();
return (tuples);
}