Can't update customer error is: can't set unsubscribe

Hello:

I pull out a customer object from Netsuite:

CustomerSearchBasic customerSearch = new CustomerSearchBasic();
customerSearch.setEmail(new SearchStringField("my@email.com",SearchStringFieldOperator.is));
SearchResult searchResult = serviceManager.search(customerSearch);
RecordList recordList = searchResult.getRecordList();
Record[] list = recordList.getRecord();
Customer customer = (Customer) list[0];

I get the customer just fine.

But, when I try to update it (Making no changes):

serviceManager.update(customer);

I get this error:

You do not have permissions to set a value for element unsubscribe due to one of the following reasons:
1) The field is read-only;
2) An associated feature is disabled;
3) The field is available either when a record is created or updated, but not in both cases.