Release : 16.0
Component : CA Top Secret for z/OS
There are normally two security checks when routing a transaction across a MRO link. There is a check for the link acid to see if the region can do the transaction and a check for the userid that issued the transaction (if attachsec=identify). One can eliminate the link check by defining the regions as similar.
Review the follow CICS doc for setting up your LINK security :
Setting up Auditing, Reporting and Surveillance