F-28 cash discount not posting to G/L account

Hello All,

when I am doing incoming payments for a customer with cash discount as per the setup from payment terms. customer is eligible for cash discount and in F-28 i am able to see amount in the cash discount column. This cash discount amount is posting it to customer account with PK as 08. Normally it should post it to cash discount G/L account with PK 40. But this is not happening. I have defined a seperate G/L account for cash discount and assigned it in tcode OBXI.

I have checked tcode OBU1,FBKP, OBXH. everything is fine.

Please let me know the config to enable the automatic posting to cash discount G/L account.

Thanks In Advance

Mahesh Gowda