Check duplicate asset number during MIGO

Hi MM/Abap Gurus ,

What user exit can be used to check duplicate asset number during GR. E.g: I have a PO with same asset number for item line 1 and 2. What user exit can be used to set warning msg if duplicate asset number exits during MIGO. Please advise if there any user exit can be used for my requirement?

Thanks

Mitra