Procedure Call from .xsjs: Nothing happens in database

Dear all,

I want to call a procedure from an .xsjs file by the following code:

// Executing the call

var conn = $.db.getConnection();
var cst = conn.prepareCall("CALL \"_SYS_BIC\".\"Sentiment_Analysis.models/analyze_messages_v2\"()");
cst.execute();

// Displaying "Hello World" in the browser

$.response.contentType = "text/plain";
$.response.setBody( "Hello, World !");

cst.close();
conn.close();

"Hello World" is displayed in the browser. The procedure should calculate sentiments and write the results in a table. However, nothing changes in the result table in the database.

The procedure has no input or output parameters. When called from the SQLConsole within the HANA Studio, everything works fine. Does anyone see what I am missing?

Cheers

Florian