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Hello,
In Odoo 10 creating a new product by
Purchases/Products/Products -> Create
causes: Odoo Client Error TypeError: el is undefined
It is not possible to save the product because of error: [object with reference: Tax - account.tax]​
i'm using multy companies it works for the others but not in this companie also i added the taxes by import csv from another company maybe that's the reason 

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Best Answer

As per the below issue link, please find the below solution suggested.

Well actually it's a known issue. When we delete a record, the linked default values are not deleted (too complex to cover all cases).
To fix that, you have to go back to settings and put a different value/remove it. 

https://github.com/odoo/odoo/issues/4514

So form invoicing go to settings and select the tax from the list because you just create them.

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Author

thank you for the answer but i didn't delete any record i just created new ones by the import csv

Try to create a new tax manually and then from invoicing settings assign it to purchase tax and try to create product.

Author

i found out that the default sales and purchase tax are not defined

thank you

That's what I suggested: So form invoicing go to settings and select the tax from the list because you just create them