Error when changing product UOM in purchase order line

[David Lefever @ Taktik]

In OpenERP V6.1, when creating or modifying a purchase order line, if we change the Product UOM (product_uom), an error is raised:

 File "/home/odoo/runbot/static/openerp-dev-6-1-31025/server/openerp/addons/purchase/purchase.py", line 710, in onchange_product_uom
    name=name, price_unit=price_unit, notes=notes, context=context)
TypeError: onchange_product_id() got an unexpected keyword argument 'fiscal_position_id'

This is caused by the module warning, in the file warning.py, the signature of the method onchange_product_id is not correct, it declares a keyword fiscal_position, but in purchase/purchase.py the keyword is fiscal_position_id.

Tested on the runbot with the latest 6.1 version, openerp-dev-6-1-31025.

Regards,
David.