Method: CONSTRUCTOR
Method: FILL_BUFFER
Method: READ_BUFFER
Method: IF_FVD_FIELDCATALOG~GET_FIELD_CATALOG
Method: IF_FVD_FIELDCATALOG~MODIFY_SCREEN
Method: IF_FVD_FIELDCATALOG~MODIFY_ALV_FIELDCAT
Method: SET_CONTEXT
Method: GET_FIELDCATALOG