passing ids as integer to account.account write method throws KeyError: "Field '0' does not exist in object 'browse_record'...

If "ids" is passed to write as integer instead of a list you get this:

Traceback (most recent call last):
  File "/home/simahawk/dev/openobject/stable/server/bin/osv/osv.py", line 122, in wrapper
    return f(self, dbname, *args, **kwargs)
  File "/home/simahawk/dev/openobject/stable/server/bin/osv/osv.py", line 176, in execute
    res = self.execute_cr(cr, uid, obj, method, *args, **kw)
  File "/home/simahawk/dev/openobject/stable/server/bin/osv/osv.py", line 167, in execute_cr
    return getattr(object, method)(cr, uid, *args, **kw)
  File "/home/simahawk/dev/openobject/stable/server/bin/addons/account/account.py", line 552, in write
    self._check_allow_type_change(cr, uid, ids, vals['type'], context=context)
  File "/home/simahawk/dev/openobject/stable/server/bin/addons/account/account.py", line 525, in _check_allow_type_change
    for account in self.browse(cr, uid, ids, context=context):
  File "/home/simahawk/dev/openobject/stable/server/bin/osv/orm.py", line 189, in __getitem__
    name, self))
KeyError: "Field '0' does not exist in object 'browse_record(account.account, 33)'"

as you can see the error occurs into _check_allow_type_change whereas at line 523 [1]:

for account in self.browse(cr, uid, ids, context=context):

the problem can be easily solved using:

if not isinstance(ids,list):
    ids = [ids,]
for account in self.browse(cr, uid, ids, context=context):

The weird thing is that also at line 544 [2] we have:

if 'company_id' in vals:
            move_lines = self.pool.get('account.move.line').search(cr, uid, [('account_id', 'in', ids)])
            if move_lines:
                # Allow the write if the value is the same
                for i in [i['company_id'][0] for i in self.read(cr,uid,ids,['company_id'])]:

beside the horrible nested for.... this *is going to fail* whenever ids is not a list.

I supposed you've been lucky till here because probably when 'company_id' is in vals you have always a list...

This bug is similar to https://bugs.launchpad.net/openobject-addons/+bug/740202

[1] http://bazaar.launchpad.net/~openerp/openobject-addons/6.0/view/head:/account/account.py#L523
[2] http://bazaar.launchpad.net/~openerp/openobject-addons/6.0/view/head:/account/account.py#L544