using PCM_OP_SUBSCRIPTION_PURCHASE_DEAL

We are trying to purchase a product with discounted price, have tried to purchase a product after updating PURCHASE_DISCOUNT field under product array of input flist, but product is purchased with same amount but not discounted.
PFB input flist :-

0 PIN_FLD_POID           POID [0] 0.0.0.1 /account 358146 0

0 PIN_FLD_PROGRAM_NAME    STR [0] "Testing"

0 PIN_FLD_END_T        TSTAMP [0] (1435690178) Tue Jun 30 12:49:38 2015

0 PIN_FLD_DEAL_INFO    SUBSTRUCT [0] allocated 20, used 5

1     PIN_FLD_PRODUCTS      ARRAY [0] allocated 20, used 12

2         PIN_FLD_QUANTITY     DECIMAL [0] 1

2         PIN_FLD_PURCHASE_START_UNIT    INT [0] 0

2         PIN_FLD_PRODUCT_OBJ    POID [0] 0.0.0.1 /product 256899 0

2         PIN_FLD_STATUS         ENUM [0] 1

2         PIN_FLD_CYCLE_DISC_AMT DECIMAL [0] 0

2         PIN_FLD_STATUS_FLAGS    INT [0] 0