We use
#ThomsonReuters.Dss.Api.Extractions.ExtractionRequests.ElektronTimeseriesExtractionRequest
request to get data for the previous day for different instruments (Thomson Reuters Classification Scheme Description = 'Option'). We run the import at 3am every day, but only on Fridays "Open Interest" field is populated at that time. This field is populated for the previous day if we run import during the next day.