Assigning Methods to MTE Classes and Monitoring Properties Variants 
Use
Collection methods and analysis methods are automatically assigned to MTE classes at system installation by SAP's data supplier.

You will only need to assign a method or methods to an MTE class if you write your own data supplier program. You will also need to assign a method to an MTE class if you want to set up an auto-reaction method or to change the analysis method that was specifed by SAP.

Do not change the assignment of collection methods. This interferes with the correct running of the data supplier program.
From Release 4.6A, methods that have been assigned to MTE classes can also be assigned to monitoring properties variants. The advantage of this is that you can execute different methods in different monitoring properties variants, providing you with greater flexibility in monitoring your R/3 System.
Procedure

You do not have to assign a method to each MTE class in the monitoring architecture. Where you have not specifed a method for an MTE class, by default the system uses the method that is assigned to the higher-level MTE.
See also:
Method Assignments Creating and Changing Monitoring Properties Variants