package to calculate cash discount from toad

Hi,

Please let me know, what is the package name to calculate cash discount from back end (Toad).

Tried with these packages.

1) SELECT apps.arp_discounts_api.get_available_disc_on_inv

                     (p_applied_payment_schedule_id      => 980857,

                      p_apply_date                       => '21-APR-2017',

                      p_amount_to_be_applied             => 10000

                     )

      ln_discount_amt

     FROM DUAL

2) apps.arp_discounts_api.get_discount

Both are not calculating, showing as 0.

Thanks in advance.

DK.