I have a module in V7, from this call and send parameters to function that other module in V8. In Module V8 take correct the datas send from V7. The problem is to write create a row of V8 and write in it fields, I try with:

self.field_v8 = value_of_v7

self.write({'field_v8': value_of_v7})

self.pool.get('modulev8').write({'field_v8': value_of_v7})

And any work, all not write nothing in fields. 

I search and see in many parts and not found how work correctly with v8 and v7.