Performance issue of currency conversion in HANA calculation view

Hi All,

I've created two graphic view to realize currency conversion.

The lower layer view contains some logic of getting data from source table and processing some join and union process. This view will provide about 100 rows aggregated data (7,000 rows before aggregation) and  the execution time of this view is about 200 ms.

Then I created a upper layer view to do the currency conversion based on the data provided by the lower layer view. But the execution time of currency conversion for these rows is about 2 s, which is quite a long time.

Please suggest me on this problem.

Thanks in advance.

Edward