@sujit, a few questions.
Which API are you using? If it is .NET, the Data API does not have access to the fundamental database, only real-time and time series.
Which asset are you looking to get Total Return for? TR.TotalReturn refers to equities.
Here is an example in Excel:
=TR("AAPL.O","TR.TotalReturn","SDate=0D EDate=-1AY")
Here is the same result in the Python API:
I downloaded single query sample excel book from https://docs-developers.thomsonreuters.com/1535000730857/12020/ that has field list mentioned as TRDPRC_1.HIGH etc. When I replace those fields with TR.TotalReturn, it returns invalid field. But TRDPRC_1.HIGH etc returns valid nos. singlequery.png
@Zhenya Kovalyov Thanks for pointing this out. However, when I try to initialize Dex2 seession, it throws up an error: 53:File not found: PLVbaApis.dll
When I try to add this dll to References-VBA project, it says: Cant add a reference to the specified file
Regard
Sujit