if i change the code inside themes item-post
to
$categories = Category::newInstance()->toTree(false, osc_user_is_company()); ?>
<?php if(!osc_user_is_company()) {
$categories = Category::newInstance()->toTree(true, osc_user_is_company());
ItemForm::category_select($categories);
it works
exept i think this is not correct scripting
please help me