Devishree Brahmbhatt (OpenERP) (dbr-openerp) has assigned this bug to you for 
OpenERP GTK Client:

adding in context on a one2many list a group_by and giving 1 single fieldname 
ex:context="{'group_by':'fieldname1'}" works fine, but giving a list gives an 
error ex:context="{'group_by':['fieldname1','fieldname2']}"
on GTK client: \bin\widget\view\list.py at line 180, in load If not 
rec.value.get(field,False): TypeError list objects are unhashable.

I have found a patch by adding 1 line of code on line 161 in list.py. by adding 
this line of code:
gb= (gb!=[] and isinstance(gb,list)) and (len(gb[0])>0 and 
isinstance(gb[0],list)) and gb[0] or gb

** Affects: openobject-client
     Importance: Low
     Assignee: OpenERP sa GTK client R&D (openerp-dev-gtk)
         Status: Confirmed

-- 
[6.0.1] group_by in context on one2manylist
https://bugs.launchpad.net/bugs/722989
You received this bug notification because you are a member of OpenERP sa GTK 
client R&D, which is a bug assignee.

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