As the post title implies this post is about a problem which can occur very often while you are using multiple Trusted systems.
Trusted systems in SAP terminology means that one user can logon multiple systems using just one signing.Trusted/trusting system relationship has the following features.
- Signing just one time for multiple systems
- Setting extra conditions for connection ( for ex. timeout for RFC connection)
- Maintaining authorization separately for each system
Configurations of this relationship can be done via SMT1 for target system(server/trusted) and via SMT2 for source system(client/trusting) .
Going back to the problem , error tells us that it is arised from absence of an authority.You can see this error as a dump in ST22 screen.
As you can see ‘How to correct the error’ section directly gives solution for the problem. It says the user is lacking S_RFCACL in his profile either in Calling or in Called systems.