I am using CSVI Pro 7.12.0 with Virtuemart add-on on a Joomla 3.9.6 alongside with a Virtuemart 3.4.2 running on a PHP 7.1.29.
I am facing an issue trying to update virtuemart custom field for parent and child products. Some child product custom fields are derived from parent product custom fields, which i would like to disable using the virtuemart built-in checkbox.
The problem is that one of the two derived custom fields is being disabled but the other is not!

I am attaching a backup of my template and a short version of my import file (given example is in line 7). Let me know if you need any other information!
Thank you in advance!
P.S.: I am also getting this message when import finishes:
An error has occured during the import. Below the information received from the server.
Status error: 200
Status message: OK
i{"process":false,"url":"administrator\/index.php?option=com_csvi&view=logdetails&run_id=76&return=aHR0cHM6Ly9kZW1vLm1hZGljYXJwZXRzLmdyL2FkbWluaXN0cmF0b3IvaW5kZXgucGhwP29wdGlvbj1jb21fY3N2aSZ2aWV3PWltcG9ydHM="}
But my import finishes OK!My server's memory is 512M. I believe that it is more than enough for such a short file!