Gateway Workflow Purchase Order

Hi,

I'm trying to expose Purchase Order workflow (WS20000075) from Material Management by gateway, it should be possible to accept or reject given purchase order.

I'm not sure how should I approach that problem i've tried few solutions but they were obsolete: ie.
http://www.sdn.sap.com/irj/scn/go/portal/prtroot/docs/library/uuid/b01f6a02-5464-2e10-bd8b-efa13d7f20b6?QuickLink=index&overridelayout=true&50968377298223

http://www.sdn.sap.com/irj/scn/go/portal/prtroot/docs/library/uuid/b01f6a02-5464-2e10-bd8b-efa13d7f20b6?QuickLink=index&overridelayout=true&50968377298223

I've tried to follow this tutorial:
http://www.sdn.sap.com/irj/scn/go/portal/prtroot/docs/library/uuid/9050238c-6ae0-2e10-7eb8-d261a236092c?QuickLink=index&overridelayout=true&52596169518430

but I have my backend and gateway on the same machine instance. So I've configured as described in section 4.1, skipped 4.2 and in section 4.3 i skipped steps 1-5 and in step  7 as SAP System Alias i written LOCAL.

I also found this topic: http://scn.sap.com/thread/3377297, but I'm not sure if Purchase Order Workflow is using dialog screens.

Best Regards

Ireneusz