Attach the XML file from application server to the purchaseorder via GOS in background and stoes the attachment in SAP DB archive link in Kpro

Hi Abap Experts,

I have one requirement to create the xml attachment in the purchase order via GOS from the application server  and stores the attachment in SAP DB archive link - which is working in foreground mode from the PC for the xml file attachment  but I need to from the application server -xml file attach in PO via GOS and stores in SAP DB via Kpro instead of PC.

It is very urgent.Kindly provide some sample code or some BAPI or FM or method can be used in background case.

One clarification-Is it required always file path to attach the xml file for the  storing in sap DB table archive link or only I can pass the File contents and it will do the further work by the standard FM or BAPI.

Thanks in advance.

Thanks and Regards,

HP