when you use the REST and JSON protocol handlers, you should get VSM entries that contain EXACTLY the number of parameters as elements in your json messages.
SV/DT will want to match that there are EXACTLY the same NUMBER and NAME of each parameter. you can use Magic string to say you don't care about the CONTENTS of some fields,
but they MUST be there. add one, no match, take one away, no match.
also make sure you have or not, the trailing / on your URL string. it matters too. needs to match whatever is in the VSM set of operations and url strings.
(to get with and without traiiling /) you have to duplicate the list of the other kind. (with and then remove / or without and then add /)
you can also turn on VSI matching debugging to help,
in lisa_home/logging.properties
log4j.logger.VSE=DEBUG, VSEAPP