CC5.2: Logical and Cross Systems - Best Practices

Hello,
we are using CC5.2 in a landscape of multiple SAP systems. In order to streamline the process of creating our rule set I would like to clear up my confusion about the use of logical and cross systems.
Here my questions:
1. Are logical systems intended for encapsulating systems of following stages (e.g. DEV1, QA1, PRD1) or to group systems of one stage which have the same structure of risks and therefore can share rules (e.g. DEVECC1, DEVECC2, ...)?
2. I don't see entries of logical systems in the Rule Architect - wouldn't it make sense to create functions for logical systems instead of uploading function authorizations for each system?
3. When you create functions for one sample system - is it sufficient to generate the rules for the logical system the sample system belongs to?
4. Regarding the cross systems functionality: After creating risks across different systems - is it still necessary to create corresponding cross systems and to generate the rules from the cross systems menu?
Thanks for your help in advance!
Regards,
Martin

Hi Frank,
thanks for your answer.
I now see the handling of logical systems as independent from system landscape tiers. After recreating the desired logical system for a second time it now also appears in the Rule Architect and in the upload dialog of function authorizations. I guess that after uploading them it's still necessary to generate the rules for logical systems in the configuration tab under 'logical systems' ?!
Regarding the cross systems functionality I don't understand the redundancy of the different settings. Actually there are four options for cross system checks. Let's go into detail:
a) Functions can include actions of different systems...
b) ...and they can be flagged as cross system functions. --> Should not the system automatically set the analysis scope of a function to 'cross system' when functions include actions of different systems or is this flag used for the analysis of logical systems?
b) Risks can include functions referencing to different systems. --> In my understanding it is essential that in this case the analysis scope is 'cross systems'. Is it still necessary to create cross systems and to generate rules for those? (Seems a bit redundant.) Or does one option take precedence over the other?
c) Finally you can setup 'cross systems'. --> How is the relation of cross systems to the other settings mentioned above? Do you have to create cross systems for each combination of systems which are related in risk definitions or function definitions? Or can all related systems be accumulated in one overall cross system?
Hope, there is not too much confusion now
Thanks and regards,
Martin

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