Event DSAVE -(BDT) contract account change

Hi,

I have a requirement to throw a pop-up when user attempts to put a dunning lock in CAA2 and press save. Now i understand we can code for it in BDT event DSAVE. My question is , how do I read values entered by user from screen? Like, how do I get the lock reason etc value which user has entered on screen ?

I tried to use function modules  VKK_FICA_FKKVKP_GET' and VKK_FICA_FKKVK_GET, but apparently they dont give output which has lock information populated.  Any insight into this?

Regards,

AM