Window frame specification not supported

Hello All,

I am running a query using Window functions. I have also referred SQL HANA reference guide which says HANA does support Window functions. When I run the query I end up with following error.

SELECT  Y.COL1, SUM(Y."COL2") OVER (PARTITION BY Y."COL3"

                                                              ORDER BY Y."COL4" 

                                                              ROWS BETWEEN UNBOUNDED PRECEDING AND CURRENT ROW  ) as "SUM_TEST" .......

Error :

SAP DBTech JDBC: [7] (at 79): feature not supported: Window frame specification not supported: line 3 col 65 (at pos 79)

The position of the error is indicated in red color above. Accordiong to this and referring also this my query looks fine.

Any suggestions would ne highly appreciated.

Thanks

Sangamesh