VM3.0.16 customfield broken update to cart(Closed)

[AnthonyWang]

after upgrade 3.0.14 to 3.0.16,
my own customfield plugin only can update to cart in "addtocart" position,
if in other position,customfield can't update to cart page:

Code Select Expand

<?php  echo shopFunctionsF::renderVmSubLayout('customfields',array('product'=>$product,'position'=>'example')); ?>
so, is customfield change any rule in 3.0.16?

Found another solution

[Milbo]

It must be within the form, which is described in /sublayouts/addtocart.php