table for customer credit limit history

Hi Gurus,

Customer has credit limit on 01-0102010 as 1000 and we changed on 20-06-2010 as 2000 and on 30-10-2010 as 3000. The table KNKK is displaying only present credit limit as 3000. I want historical credit limit data also like 2000 and 1000.What is the table name to get credit limit historical data for customer.