While trying to deploy a workflow process or a custom business service as Web Service, using "Deploy as Web Service..." right mouse click menu item of in Siebel Tools:

1) Unable to create the Business Service 'Web Service Deployment Service'(SBL-DAT-00227)
2) Could not find 'Class' named 'Web Service Deployment Service'. This object is inactive or
    nonexistent.(SBL-DAT-00144)

Cause
The missing standard Business Service is part of the Siebel Repository change that comes with the ACR331 delivery of the Siebel Fix Pack: 7.8.2.5 and above.

This ACR Backports Siebel Customer Order Management version 8.0 Catalog, Asset, Pricer, and CFG broker Web Services to Siebel 7.8.2.5, and also it backports the core framework (Hierarchy and EAI IO to XML Converter) to support the ability to subscribe to catalogs, customer assets, and prices from an external application as a service.

Solution
Complete the ACR 331 installation steps, outlined in the "Instructions for ACR 331" section of the "Configuration Instructions for Enhancements and Updates" chapter in the "Siebel Maintenance Release Guide" document.

This document is supplied starting  with the 7.8.2.5 Fix Pack of 7.8 Release

After running of the Fix Pack for Siebel Tools, the REPPATCH folder of Siebel Tools installation root, will contain the "ACR331ImportFilesApps.v1205.zip" and "ACR331ImportFilesCore.zip" files with the to be installed Siebel Repository improvements.