Hello,

You Can Call write Method For Assign Or Modify Value OF M2O From Another Object.

Example:

@api.multi

     def write(self, values):

         your_obj = self.env['object.object].search([(as per your Condition)])

         your_obj.write({

                        'your_field_from_another_object': 'your_field_from_current_object.id'

                        })

Hi,

you can write the value of that field.

eg:

@api.multi
def function_in_current_model(self):
 record = self.env['model.of.the.record.you.want.to.change.the.field.value'].browse(record_id)
 record.write('many2one_filed_name': id)

Thank you.