Attachment from Requisition header to Purchase Order

We are 12.1.3.  Normally if a requisition created from Core Purchasing form, then  Header attachments from Purchase requisition  will flow to each line in the Purchase Order during autocreation (meaning duplicates to each and every line) and Purchase Order header will not contain any attachments.

We are now  creating requsitions from Iprocurement. As per the Note 1522574.1 - if Profile  POR: Convert One Time Document To Standard Document is set to 'yes' , then  header level attachments will flow to PO header. Tried setting this Profile to 'Yes'. But still it is not working. Is there anyother setup required to achieve this from Iproc requisitions.