the rounding function is not available via configuration to be restricted at PR. it will happen in PO based on the control profile maintained if you check rounding control profile under quantity optimizing and control in logistics you will understand this .The application is Purchase order .
Now if you don't want the rounding values to be adopted to PO then you can use a control profile with Cancel rounding for your PO
check spro> logistics gen>qty optimizing and allowed logistics UoM
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