Hi,
Yes, you can!
During creation of Purchase order, you can select "GR Non Valuated" check box in the Delivery TAB of Purchase order and do goods receipt which result no accounting entries.
OR
If you are creating Purchase order with account assignment category,then use t.code:OME9,
select your account assignment category and select check box of "GR Non-Valuated" & save.Do PO creation with your account assignment category and go for goods receipt which result no accounting entries
Regards,
Biju K