One2many field in odoo

 In this blog we will explain how to control the line in one2many fields in odoo

(0, 0,  { values }) link to a new record that needs to be created with the given value
dictionary 

(1, ID, { values }) update the linked record with id = ID (write *values* on it)

(2, ID) remove and delete the linked record with id = ID (calls unlink on ID,

that will delete the object completely, and the link to it as well)

(3, ID) cut the link to the linked record with id = ID (delete the relationship between

 the two objects but does not delete the target object itself)

(4, ID) link to existing record with id = ID (adds a relationship)

(5) remove all (like using (3,ID) for all linked records)

(6, 0, [IDs]) replace the list of linked IDs (like using (5) then (4,ID) for each ID in the list of IDs)