How to manage session ID while invoking cpq webservice through OICS

Summary

genrate session ID dynamically

Content

Hi All, 

Im trying to trigger data table soap webservice from OICS, have hard coded <bm:sessionId>, <bm:category  same as sample input in applicarion. immidiate invoke is working fine but after some time getting session id invalid error . is there any logic to build session id dynamically.

 

Regards,

Sdheer.