[fix] problem in function field not returning correctly all fields
lp bug: https://launchpad.net/bugs/882991 fixed bzr revid: nicolas.vanhoren@openerp.com-20111028094816-zzgm34hubp5w0s5h
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lp bug: https://launchpad.net/bugs/882991 fixed bzr revid: nicolas.vanhoren@openerp.com-20111028094816-zzgm34hubp5w0s5h