Invoice matching

All,

I have created a PO for imported material .

Suppose PO is for 100 qty and amount is 5000 USD .

Now first received invoice of Import vendor and directly entered in FI and given payment for that .

Now goods arrived and done MIGO .

Now there will be no invoice verification (MIRO) done because its invoiced in FI and payment already done .

So any problem in this scenario ?

Without doing MIRO whether the PO will be opened everytime ?

Or any risk in doing this way ?

Please explain .

regards