htmlb:inputField always uses encode="TRUE"

Hi,

I have a inputField using data binding. The model field contains "Česká republika", and this code

<htmlb:inputField id="InpSupl" value="//model/edit_wa.supplier" encode="FALSE"/>

Renders to

<input class="sapEdfTxtEnbl" size="60" maxlength="60" name="cont_INVEST_invest_edit_wa.supplier" id="cont_INVEST_InpSupl" value="&amp;#268;eská republika">

How can I prevent this HTML-encoding?

Version 6.40 SP 12.

Thanks,

Thilo