Fixing error code U012D (Lin disconnected) - Alternator

Dear members,

I have a ford focus ST LINE eco blue 2018, I have changed my alternator to a 350A for car audio, with an external regulator

So far we had to disconnect LIN I need to know how to disable it from ECU for delete error in forscan error code U012D I tried entering in PCM module, disable primary alternator, also disabled BMS and all things related with battery but no way to delete this error

Not sure if changing AS-BUILT

I dont know what more to do to disable LIN and stop geting this error with battery warning check

Any ideas? I have forscan myself and I can do whatever you ask