Hi Harrish,
If you required that system will calculate component's value as per actual present day then you have to change PC10 as 1 from 4. If you will change that then system will calculate your basic pay for 21 days = Rs 2032 /- . But I think you should identify first why customization has done for /804? Was it to fulfill any requirement of the users? Identification is necessary to make the process correct.
Thanks