supplier invoice : error if modify tax amount

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 affects openerp

If I create a new supplier invoice, I put a line with tax, compute tax
and modify the tax amount (to round the amount to 5 cents for example)
=> save

I put into the total field (just after reference) to the exact amount
which is into the computed total (botom) => the error : Please verify
the price of the invoice !
The real total does not match the computed total.

apear even if the amount is exactly the same !!!
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