validate not working when i use – get_template_part

Hallo,

i have the problem, that if i load a php validation code like this:
<?php get_template_part( 'ssi/struc', 'en_formprocess_frontpage' ); ?>
the validation does not work.

but if i place the code directly in frontpage.php, it works as expected. why?
is there another way to load the php in the template from outside. i know that include is not an option…or is it?

thanx