Regarding amount discription field

Hi Experts,

I created sap script for payment print prog and for that i use standard prog RFFOUS_C. in my sap script amount fied REGUP-DMBTR.... i use for sap script total three tables REGUP, REGUD, REGUH

<b>my form design is</b>

amount discription amount

xyz 1000

amount is words

one thousnad only

Now what i want i have amount field REGUP-DMBTR but for amount discription which field i use??? i find but i didn`t get......

so how can i find amout discription(particulars) field