GS1-128 code in NAV2016

Hi everyone,
In different customer with NAV 2016-2018 verison, we have installed a barcode generator development. We didn’t have any problem until now.
But for one of our customers, the requisites have changed. Now, instead of a code128 barcode, we hace to generate a gs1-128 code, and I don’t see the way to do it with the actual codeunit.
Any hint on this?
Thank you all!!