Basically you have to manually build EDI 855 (Accept/Reject/Pending order) mapping flows based on the trading partner guidelines and pulling some of the 850 PO information such as OrderID,Delivery request dates,shipto,payment information etc…) if required.Once you have created edi 855 using WmEDI services (convertToString,addICEnvelope)route the document to TN via routeXML and deliver the document to trading partner.
Please go thru the webMethods EDI Module Users Guide for building and processing EDI documents.
Also you can automatically generate and send 997 FA proof or receipt for received 850 transaction etc.
Bottom line is there is no automated service that does 850 to 855 PO Ack conversion,please follow the comments as mentioned above.
HTH,
RMG
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