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["moylop260 - http://moylop.blogspot.com/" <moylop260@xxxxxxxxxxx>]

Hello XRG, thanks for reply.

The legal form is:

when len(vat)==13
[A-Z|a-z|ñ|Ñ|&][A-Z|a-z|ñ|Ñ|&][A-Z|a-z|ñ|Ñ|&][A-Z|a-z|ñ|Ñ|&][0-9][0-9][0-1][1-9][0-3][0-9][A-Z|a-z|ñ|Ñ|&|0-9][A-Z|a-z|ñ|Ñ|&|0-9][A-Z|a-z|ñ|Ñ|&|0-9]

ABCD%y%m%dZX9
ABCD850414ZX9

when len(vat)==12
[A-Z|a-z|ñ|Ñ|&][A-Z|a-z|ñ|Ñ|&][A-Z|a-z|ñ|Ñ|&][0-9][0-9][0-1][1-9][0-3][0-9][A-Z|a-z|ñ|Ñ|&|0-9][A-Z|a-z|ñ|Ñ|&|0-9][A-Z|a-z|ñ|Ñ|&|0-9]
BCD%y%m%dZX9
BCD850414ZX9


Some companies, put a intermedian "-"
BCD-850414-ZX9
Or "_"
So, I remove these special values with filter


I can generate a patch with regexp.


There is a reference: 
http://es.wikipedia.org/wiki/Registro_Federal_de_Contribuyentes_(M%C3%A9xico)

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OERPScenario, which is subscribed to the OpenERP Project Group.
https://bugs.launchpad.net/bugs/749958

Title:
  [trunk] [base_vat] [base_vat_mx]: Wrong validation

Status in OpenERP Modules (addons):
  New

Bug description:
  Hello, the base_vat_mx validation there is bug.

  I have a fix
  I attach the patch