I have tried the following:
JSONOrderedObject reportTemplateJSONObject = new JSONOrderedObject()
                .put("@odata.type", "#ThomsonReuters.Dss.Api.Extractions.ReportTemplates.TickHistoryTimeAndSalesReportTemplate")
                .put("ShowColumnHeaders",true)
                .put("Name", trthTickReportTemplateName )
                .put("Headers", new JSONArray() )
                .put("Trailers", new JSONArray() ) 
                .put("ContentFields", new JSONArray()
                    .put( new JSONObject()
                        .put("FieldName", "Quote - Ask Price")
                        .put( "Format", JSONObject.NULL)
                        .put("Label", "Quote - Ask Price"))
                    .put( new JSONObject()
                        .put("FieldName", "Quote - Ask Size")
                        .put( "Format", JSONObject.NULL)
                        .put("Label", "Quote - Ask Size"))
                    .put( new JSONObject()
                        .put("FieldName", "Quote - Bid Price")
                        .put( "Format", JSONObject.NULL)
                        .put("Label", "Quote - Bid Price"))
                    .put( new JSONObject()
                        .put("FieldName", "Quote - Bid Size")
                        .put( "Format", JSONObject.NULL)
                        .put("Label", "Foo - Bid Size"))
                    )
                .put("Condition", new JSONOrderedObject()
                     .put("ApplyCorrectionsAndCancellations", false)
                     .put("MessageTimeStampIn", "LocalExchangeTime") //All rics in this template are for london so extract in london time
                     .put("QueryStartDate", sdfz.format(c1.getTime()))
                     .put("QueryEndDate", sdfz.format(c2.getTime()))
                     .put("ReportDateRangeType", "Range")
                     .put("SortBy", "SingleByTimestamp")
                     );


I have done something similar for MarketDepth template as well. I understand the Depth is trickier as you can have multiple levels, but my hope is that if I specify something like the below then I would get “L1-My AskPrice”, “L2-My Ask Price” etc.


.put("ContentFields", new JSONArray()
                    .put( new JSONObject()
                        .put("FieldName", "Ask Price")
                        .put( "Format", JSONObject.NULL)
                        .put("Label", "My Ask Price"))

Client is trying to Label content fields to constrain the column headers returned so that she knew what column the respective data is in.

For example:

-when she specify FieldName “Quote – Ask Price” for Time and Sales report template the resulting column is “Ask Price”

-when she specify FieldName “Ask Price” for Market Depth report template, the resulting column is “L1-AskPrice"

She is saying "the columns in the csv are also not in the same order as she put in her JSON object. Basically, when we create interface adapters we try to avoid hard coding values, plus who’s to say your API returned column header names does not change in the future, so basically I need a way of labelling the columns so I know for each FieldName exactly what column index it will be or failing that what header name it will be.please advise why the above two code snippets are having no effect on the column headers returned?"