I have created a macro (using the recorder) that save automatically a 
spreadsheet in html format, once it is opened. That is the code that has been 
generated

sub record_html
rem ----------------------------------------------------------------------
rem define variables
dim document as object
dim dispatcher as object
rem ----------------------------------------------------------------------
rem get access to the document
document = ThisComponent.CurrentController.Frame
dispatcher = createUnoService("com.sun.star.frame.DispatchHelper")

rem ----------------------------------------------------------------------
dim args1(2) as new com.sun.star.beans.PropertyValue
args1(0).Name = "URL"
args1(0).Value = "file://tmp/test_graph1.html"
args1(1).Name = "FilterName"
args1(1).Value = "HTML (StarCalc)"
args1(4).Name = "SelectionOnly"
args1(4).Value = true

dispatcher.executeDispatch(document, ".uno:SaveAs", "", 0, args1())

max index for objects is defined args1 to 2, whereas after index 4 is used.
When I then run the macro I got the following error
Inadmissible Value or DataType - Index out of defined range 

This seems to be a recorder issue. manual correction of the macro solved the pb.