Definition
A combination ID is a technical help structure that represents the search result for a combination of attributes or characteristics.
Use
Used to indicate a determination combination that is used as initial access to determination.
The combination ID identifies a group of combinations of attributes that deliver the same result using a
selection rule.The value for the combination ID controls whether determination is triggered in the preselection, or whether a logical service is called up: If the combination ID has a value that is not 0, a logical service is called up.

You can use the determination function to find each remuneration. You should only use this method in test cases since it has a strong effect on system performance.
In the productive system you need to use a logical service.