Field help (CR0TYPCRG) 

Use this field to select an expenses type for this rule. You could, for example use expense types to specify the cost of an external course, travel expenses and overnight accommodation.

Four codes are provided by default; their values are calculated by the system if set up appropriately in the pay plan:

This field is mandatory.

The codes are defined in miscellaneous table 451Cost type. You do not have to use the codes above, you can define and use your own codes.