Inventory count

Hi,

1) I have a stock of physical count of 80 peices for material A . but in SAP system the same material is showing stock of 100 pieces.So 20 pieces are showing more in SAP. So then what is the normal procedure to do.

2) I have a stock of physical count of 100 peices for material A . but in SAP system the same material is showing stock of 50 pieces.So 50 pieces are showing less in SAP. So then what is the normal procedure to do. Can anyone help

Thanks,

Vamsi