Odoo unknown currency_field 'currency_id' - odoo

Question

In Odoo 9 community version, I added the following monetary field as a monetary amount via the web interface: res.partner.x_tablet_bail_amount.
It's working fine, but when installing any new module I get the following error and my module does not install.
Any help? thanks!
Odoo Server Error
Traceback (most recent call last):
File "/usr/lib/python2.7/dist-packages/openerp/http.py", line 605, in _handle_exception
return super(JsonRequest, self)._handle_exception(exception)
File "/usr/lib/python2.7/dist-packages/openerp/http.py", line 642, in dispatch
result = self._call_function(**self.params)
File "/usr/lib/python2.7/dist-packages/openerp/http.py", line 316, in _call_function
return checked_call(self.db, *args, **kwargs)
File "/usr/lib/python2.7/dist-packages/openerp/service/model.py", line 118, in wrapper
return f(dbname, *args, **kwargs)
File "/usr/lib/python2.7/dist-packages/openerp/http.py", line 309, in checked_call
result = self.endpoint(*a, **kw)
File "/usr/lib/python2.7/dist-packages/openerp/http.py", line 893, in __call__
return self.method(*args, **kw)
File "/usr/lib/python2.7/dist-packages/openerp/http.py", line 471, in response_wrap
response = f(*args, **kw)
File "/usr/lib/python2.7/dist-packages/openerp/addons/web/controllers/main.py", line 998, in call_button
action = self._call_kw(model, method, args, {})
File "/usr/lib/python2.7/dist-packages/openerp/addons/web/controllers/main.py", line 986, in _call_kw
return getattr(request.registry.get(model), method)(request.cr, request.uid, *args, **kwargs)
File "/usr/lib/python2.7/dist-packages/openerp/api.py", line 238, in wrapper
return old_api(self, *args, **kwargs)
File "/usr/lib/python2.7/dist-packages/openerp/addons/base/module/module.py", line 459, in button_immediate_install
return self._button_immediate_function(cr, uid, ids, self.button_install, context=context)
File "/usr/lib/python2.7/dist-packages/openerp/api.py", line 238, in wrapper
return old_api(self, *args, **kwargs)
File "/usr/lib/python2.7/dist-packages/openerp/addons/base/module/module.py", line 533, in _button_immediate_function
registry = openerp.modules.registry.RegistryManager.new(cr.dbname, update_module=True)
File "/usr/lib/python2.7/dist-packages/openerp/modules/registry.py", line 385, in new
openerp.modules.load_modules(registry._db, force_demo, status, update_module)
File "/usr/lib/python2.7/dist-packages/openerp/modules/loading.py", line 283, in load_modules
registry.setup_models(cr, partial=True)
File "/usr/lib/python2.7/dist-packages/openerp/modules/registry.py", line 199, in setup_models
model._setup_fields(cr, SUPERUSER_ID)
File "/usr/lib/python2.7/dist-packages/openerp/api.py", line 238, in wrapper
return old_api(self, *args, **kwargs)
File "/usr/lib/python2.7/dist-packages/openerp/api.py", line 342, in old_api
result = method(recs, *args, **kwargs)
File "/usr/lib/python2.7/dist-packages/openerp/models.py", line 3044, in _setup_fields
field.setup_full(self)
File "/usr/lib/python2.7/dist-packages/openerp/fields.py", line 476, in setup_full
self._setup_regular_full(model)
File "/usr/lib/python2.7/dist-packages/openerp/fields.py", line 1131, in _setup_regular_full
"Field %s with unknown currency_field %r" % (self, self.currency_field)
AssertionError: Field res.partner.x_tablet_bail_amount with unknown currency_field 'currency_id'

Answer 1

Fields of type monetary are using other fields to do some stuff like printing currency symbols in reports or the client. Per default currency_id is used (Odoo Code) for that process, and as far as i know there is no currency_id defined on res.partner.
So maybe you should define it or get it as related field from another relation?

Answer 2

From the source code it does not seem to be any currency_id field defined on res.partner.
However the field is indeed defined on res.company, which has a Many2One relationship with res.partner. I suppose res.partner is nothing but a kind of partially abstract class that needs to be extended for every type of partner within Odoo, including companies (only guessing here).
So Odoo is right when it spits
Field res.partner.x_tablet_bail_amount with unknown currency_field
'currency_id'
because the field is not there, really.
What you could do is, instead of defining your custom field x_tablet_bail_amount on res.partner, define it on res.company. That way your monetary field will be able to resolve the right currency instead of looking for something that does not exist.

Answer 3

'currency_id' field is added to 'res.partner' model in the 'account' mudule, so you have to add 'account' to the list of dependencies in the manifest and then the monetary field would work fine.