The purpose of custom enumerations is to allow you to create new enumerations that you can use in any custom attribute with custom fields, information cards or custom logical units.
An enumeration can be seen as a data type, so what you really do when creating a custom enumeration is to create a new data type in IFS Applications. A custom enumeration is a fixed list of values that can be stored in a specific custom attribute. Each value has a database representation and a client representation. It is also possible to translate each added enumeration client representation.
Refer Custom Enumerations