I have Student model (which includes studentId field - ID for student, not to be mistaken with student_id) and Course model. I wrote another model StudentCourse to demonstrate the relationship between aforementioned models in which it contains Many2one fields: student_id and course_id respectively. I retrieve studentId by using related field through student_id. After that, in Course model, I input another field student_course_ids (One2many) which references toward student_id. The data retrieved is correctly. However, when i tried to edit student's information in the one2many field (student_course_ids) in Course Form View, I received the following KeyError:

Odoo Server Error
Traceback (most recent call last):
  File "/odoo/odoo-server/openerp/http.py", line 648, in _handle_exception
 return super(JsonRequest, self)._handle_exception(exception)
 File "/odoo/odoo-server/openerp/http.py", line 685, in dispatch
 result = self._call_function(**self.params)
 File "/odoo/odoo-server/openerp/http.py", line 321, in _call_function
 return checked_call(self.db, *args, **kwargs)
 File "/odoo/odoo-server/openerp/service/model.py", line 118, in wrapper
 return f(dbname, *args, **kwargs)
 File "/odoo/odoo-server/openerp/http.py", line 314, in checked_call
 result = self.endpoint(*a, **kw)
 File "/odoo/odoo-server/openerp/http.py", line 964, in __call__
 return self.method(*args, **kw)
 File "/odoo/odoo-server/openerp/http.py", line 514, in response_wrap 
 response = f(*args, **kw)
 File "/odoo/odoo-server/addons/web/controllers/main.py", line 888, in call_kw
 return self._call_kw(model, method, args, kwargs)
 File "/odoo/odoo-server/addons/web/controllers/main.py", line 880, in _call_kw
 return getattr(request.registry.get(model), method)(request.cr, request.uid, *args, **kwargs)
 File "/odoo/odoo-server/openerp/api.py", line 250, in wrapper
 return old_api(self, *args, **kwargs)
 File "/odoo/odoo-server/openerp/api.py", line 381, in old_api
 result = method(recs, *args, **kwargs)
 File "/odoo/odoo-server/openerp/models.py", line 6045, in onchange
 record.mapped(field_seq)
 File "/odoo/odoo-server/openerp/models.py", line 5543, in mapped
 recs = recs._mapped_func(operator.itemgetter(name))
 File "/odoo/odoo-server/openerp/models.py", line 5523, in _mapped_func
 vals = [func(rec) for rec in self]
 File "/odoo/odoo-server/openerp/models.py", line 5761, in __getitem__
 return self._fields[key].__get__(self, type(self))
 File "/odoo/odoo-server/openerp/fields.py", line 830, in __get__ 
 self.determine_value(record)
 File "/odoo/odoo-server/openerp/fields.py", line 939, in determine_value
 self.compute_value(recs)
 File "/odoo/odoo-server/openerp/fields.py", line 894, in compute_value
 self._compute_value(records)
 File "/odoo/odoo-server/openerp/fields.py", line 886, in _compute_value
 self.compute(records) 
 File "/odoo/odoo-server/openerp/fields.py", line 587, in _compute_related
 record[self.name] = other[field.name]
 File "/odoo/odoo-server/openerp/models.py", line 5761, in __getitem__ 
 return self._fields[key].__get__(self, type(self))
KeyError: 'studentId'

I tried to edit the StudentCourse model separately in its own form view and its went through without a hiccup. But the error only occurs at the One2many view in Course model's Form View. Please help me with this. I have been look up for this matter over 3 days and no luck for me. Thanks.