There is limited ability to work with WebServices in ABAP 620. Mostly you have the ability to expose RFCs as webservices. However in 640 there is extensive functionality in ABAP to both call and expose webservices.
Check out the following weblogs or the online help for more details:
/people/thomas.jung3/blog/2004/11/15/bsp-150-a-developer146s-journal-part-xiii-developing-abap-webservices
/people/thomas.jung3/blog/2004/11/17/bsp-a-developers-journal-part-xiv--consuming-webservices-with-abap
/people/thomas.jung3/blog/2005/01/11/publishing-abap-webservices-to-an-external-uddi-server
/people/thomas.jung3/blog/2005/02/14/webservices-a-real-world-implementation-experience
/people/thomas.jung3/blog/2005/04/21/webservice-navigator-page-for-abap-and-java
/people/thomas.jung3/blog/2005/05/13/calling-webservices-from-abap-via-https
/people/thomas.jung3/blog/2005/05/09/abap-webservices-logon-language-processing
/people/thomas.jung3/blog/2005/01/05/develop-a-web-service-that-sends-an-email--in-abap
/people/thomas.jung3/blog/2005/06/05/web-services-the-case-of-the-missing-soap-action-header
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