Main Menu: Derivation Strategy for CE Rule Generation 
Use
Due to authorization issues, the derivation strategy maintained in Customizing is usually restricted to users with authorization to change Customizing objects. Furthermore, in productive system environments, changes to Customizing objects may be prohibited.
To permit restricted modifications of this derivation strategy for users without this authorization or in productive systems, the main menu contains transaction FMCERGR. Here, you can only change the derivation steps of step type Derivation rule , which have been previously created in Customizing.
Prerequisites
You must have maintained the derivation strategy to be used for generating cover groups/eligibility rules in Customizing. Note that in this transaction (FMCERGR), you can only maintain derivation steps of type Derivation Rule that have been previously set to active in Customizing. Se e Defining a Derivation Strategy for Generating CE Rules for more information.
Features
In transaction FMCERGR, you can change derivation steps of step type Derivation rule that you have activated in Customizing.
Note
In this transaction, you cannot create any new derivation steps or deactivate any derivation steps. You can also not change the target/source fields or other settings made for an individual derivation rule. You can only maintain individual table entries for derivation rules previously defined in Customizing, in order, for example, to enhance existing cover groups by adding further budget addresses or to reassign budget addresses to other cover groups.
Activities
Maintain the values for the derivation rules to be used.
Save your data.