Correct OpenERP 7 Module

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Project Description:
I have a module who adds several fields to product.product but I need these fields are shown only when the product belongs to a certain category NAME (not ID).

My module add my fields fine but I don't know the way to hide the fields when the product doesn't belong to the category.

attrs="{'invisible': [('', '!=', 'MyCategoryName')]}" don't work.

I suppose it`s something easy and quick to do for anyone skilled in OpenERP.

Skills required:
PostgreSQL, Python
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Alamanno Spain
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