Now problem is in your 'person.code4' object.
you didn't add next_number field in 'person.code4' class _columns
add it next_number:fields.integer('Sequence No'),
and in _defaults={
'next_number':lambda *a:0,
}
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OpenERP=Easier, Adaptable, Affordable, Modular
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http://www.openobject.com/forum/viewtopic.php?p=41503#41503
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