Hi Alan,
WAAS currently only supports service groups 61/62. Note that these numeric designations are really just identifiers, and don't impact order of operations or anything else. So long as the 'vendor2' device above uses some other service group numbers besides 61/62, you should be fine.
Also note that if you are configuring WCCP on a software-based platform (ISR, 7200, etc.), you will also need to configure the global command 'ip wccp check services all'.
Please let us know if you have any additional questions.
Regards,
Zach