FKK_PDC_EDIT is a standard SAP function module that performs functionality. This is available within standard R/3 SAP systems depending on version and release level.
Below are the pattern details for this FM showing its interface including any import, export and tables parameters. There is also a list of Exceptions and for your convenience any standard documentation available. All this information and more can also be viewed if you enter the function module name FKK_PDC_EDIT into the relevant SAP transaction such as SE37 or SE80.
CALL FUNCTION 'FKK_PDC_EDIT' "
EXPORTING
i_sel = " rfpdc_sel
* i_full_screen = SPACE " boole-boole
IMPORTING
e_okcode = " sy-ucomm
EXCEPTIONS
NOTHING_FOUND = 1 "
. " FKK_PDC_EDIT