unicity constraint while installing the generic chart of account

[Aline (OpenERP)]

in the "install chart of account" wizard, if "generic chart of account" is selected, a field appears in which you can set a tax value. If you complete this field, you got an unicity constraint in the "generate chart of account from template" wizard.

[2011-10-17 09:06:53,552][?] INFO:werkzeug:127.0.0.1 - - [17/Oct/2011 09:06:53] "POST /web/dataset/get HTTP/1.1" 200 -
[2011-10-17 09:06:53,646][?] ERROR:db.cursor:bad query: insert into "account_tax" (id,"domain","description","ref_tax_code_id","sequence","ref_base_sign","type_tax_use","base_code_id","base_sign","child_depend","include_base_amount","active","ref_base_code_id","ref_tax_sign","applicable_type","company_id","name","tax_code_id","parent_id","amount","python_compute","tax_sign","python_compute_inv","python_applicable","type","price_include",create_uid,create_date) values (4,NULL,E'TAX 20.0%',54,0,1.0,E'purchase',53,1.0,E'False',E'False',E'True',53,1.0,E'true',1,E'TAX 20.0%',54,NULL,E'0.2000',E'# price_unit
# address: res.partner.address object or False
# product: product.product object or None
# partner: res.partner object or None

result = price_unit * 0.10',1.0,E'# price_unit
# address: res.partner.address object or False
# product: product.product object or False

result = price_unit * 0.10',NULL,E'percent',E'False',1,now())
Traceback (most recent call last):
  File "/home/aline/source/server/trunk/openerp/sql_db.py", line 215, in execute
    res = self._obj.execute(query, params)
IntegrityError: duplicate key value violates unique constraint "account_tax_name_company_uniq"