ProgrammingError: can't adapt type 'browse_record'

OpenERP Programming error.

Error:
ProgrammingError: can't adapt type 'browse_record'

Solution:

For example, if you have provided 

            'product_id': line.product_id,
in _columns, the above error will occur. All you have to do is to provide the id of product_id as follows

            'product_id': line.product_id.id,

and it will solve the error.