Changes to access limits reset to defaults on saving product variation

I am seeing this as well.

In the dblog I see

Type:rules
Date:Monday, March 4, 2013 - 7:56am
User:admin
Location:http://www.mywebsite.com/checkout/122/payment/return/3g-CgSCv_UelaJk2hZsSHXQAv5PVZY-7rpry_ISXS2I?tx=3SN943993Y963363N&st=Completed&amt=0.25&cc=USD&cm=&item_number=
Referrer:blank
Message:Unable to evaluate action commerce_file_license_issue_order.
Severity:warning

I have the same behavior, but there is no dblog messages related. In the file field configuration the default values are UNLIMITED, but the 'time limit' value displayed (inherited?) by each product is Inherit (0).

For if is useful, I am creating programmatically the products, so I have added in the data array the desired values:

<?php
$file = (object) array(
		'uri' => $filepath,
		'filename' => $file_name,
		'filemime' => file_get_mimetype($filepath),
		'status' => 1,
		'data' => array(
					'duration' => COMMERCE_FILE_FIELD_UNLIMITED,
					'download_limit' => COMMERCE_FILE_FIELD_UNLIMITED,
     					'address_limit' => COMMERCE_FILE_FIELD_UNLIMITED
					)
	);
?>

I know that this is not a solution for the issue, is just for if is useful for someone who has the issue in that context because is a way to bypass the issue.

In bdlog i have:

Unable to modify data "created-product:field-sklep-pdf-file:data:duration": Invalid data value given. Be sure it matches the required data type and format.

I try execute php code in rules that return a value but with no success.

Any ideas?