IBM RTC 6.0.5 Add approver to multiple work items at the same time
One answer
This old article may be of help: https://jazz.net/library/article/1118
Adding Approvals to Work Items Using the Plain Java Client Libraries:
https://rsjazz.wordpress.com/2012/10/01/adding-approvals-to-work-items-using-the-plain-java-client-libraries/
There are also several jazz.net questions on this topic. They maybe helpful.