Overtime Wagetype Issue!!

Dear Experts,

I am using the IT0015 to maintain the Overtime... but as i enter the value in Number/Unit field..

its automaticaly Calculate the Amount... I did not use any Badi or Indirect Evaluation.

e.g as I enter the 1 in the Number/Unit Field its calculate the 9,281.00

Can any one tell me why its Going on?

Your Prompt response would be highly appricated.

Regards,

Rizwan