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These web logs by Thomas Jung are a must read if want to develop Web Services with ABAP. The following web logs are categorized per Netweaver release.

Relevant SDN web logs NW 2004S

Relevant SDN web logs NW 2004

Relevant SDN web logs WebAS 6.20

Relevant SDN web logs NW release independent

Relevant TechEd Presentation from Product Management

Troubleshooting ABAP Web Services (requires login - SAP Service Marketplace)