Customer Fields in Revenue Accounting Item Classes 
You can include customer-specific fields in the interface and data store of revenue accounting item classes.
Activities
For you to be able to use customer fields when configuring revenue item classes, you have to add these fields to one of the following enhancement includes:
INCL_EEW_FARR_ARL
This include is used for fields that are only used in revenue accounting items.
INCL_EEW_FARR_POB
This include is used for fields that are also needed in the performance obligations in contract management.
INCL_EEW_FARR_REP
This include is used for fields that you also want to use in evaluations.
Note
To ensure that customer fields are taken into account during the processing of revenue accounting items, the system checks the completeness of the work structures when the configuration of the revenue accounting item class is activated. The system automatically adds any missing customer fields to these structures. These fields are added in the related Customer include of the work structure.