Hello,
setting variable fields to be hidden (set IsVisible flag to false) does not 
work properly through the API. I used the code from the Snippets for hiding 
fields in Java and put it into a beanshell macro. For test purpose I also added 
a user field to hide it, too. When I run the macro, the user field gets hidden, 
but not the variable field. Doubleclicking on the variable field shows the 
checkbox "hidden" as checked. So the macro did the right thing, but there is no 
update of the state of this, I guess. I also tried the following:

XTextFieldsSupplier xTextFieldsSupplier = (XTextFieldsSupplier)
UnoRuntime.queryInterface(XTextFieldsSupplier.class, 
textDocument.getXTextDocument());
      XRefreshable xRefreshable = (XRefreshable)UnoRuntime.queryInterface
(XRefreshable.class, xTextFieldsSupplier.getTextFields());
      xRefreshable.refresh();

This did not solve the issue, so I decided to create this bug report.

Regards,
Markus