Doubts with generic service in "HCM processes and forms"

Question

Hello friends:
    Im having troubles trying to figure out how to use generic services. I implemented a badi with generic services and this have the following methods:
IF_HRASR00GEN_SERVICE~GET_SPECIAL_FIELDS
IF_HRASR00GEN_SERVICE~GET_FIELD_INFO
IF_HRASR00GEN_SERVICE~GET_OPERATIONS
IF_HRASR00GEN_SERVICE~INITIALIZE
IF_HRASR00GEN_SERVICE~DO_OPERATIONS
IF_HRASR00GEN_SERVICE~GET_HELP_VALUES
   I could initialize values of my form using only INITIALIZE method, and I could perform some validation using  and then DO_OPERATIONS.
   I cant understand what is the usage of methods like GET_FIELD_INFO and GET_OPERATIONS?? according to the badis help, get_field_info must be implemented, but i didnt do so and it worked anyway?
I will be grateful with all your help,
Best regards,

Answer 1

GET_FIELD_INFO is for adding fields. Suppose you are using the generic service for IT0008 data. The IT0008 fields
which need to be used on the adobe form has to be added in this method. You need to add field name and data element
to the field_infos table. GET_OPERATIONS is used to define operations associated with the fields. Suppose you have a
scenario when user selects personnel area all personnel subareas associated with the selected value should come.
Then you need to group together personnel area and sub area together into an operation. Also even if a field is not aasociated
with any operation, to add a field to form scenario you need group them into operations in GET_OPERATIONS.
Check the class CL_IM_HRRCF_REQUI_REQUEST to determine how this can be used.
Thanks,
Aravind