Individual PO for each line item of PR through auto PO process

Hi,

we have created SO with 5 line items. while saving it has generated PR with same 5 line items  But when system converts PR to PO through automatic PO creation process, it has created 5 PO's one for each line item of PR. Please let me know where is the settings for this.

SO               line item          PR                        PO

4107929          1                 124723225          4513098778

4107929          2                 124723225          4513098779

4107929          3                 124723225          4513098780

4107929          4                 124723225          4513098781

4107929          5                 124723225          4513098782

Thanks

Mahesh