Query in Excel Spread Sheet Validation

Dear All,

While performing the excel spread sheet validation, against manual calculation, we found that the sixth digit of manual calculation result is mismatching with the excel result. Is it any acceptable/allowable window period for these values…?? :confused:
Is any regulatory norms to be followed in these circumstances…??:confused:

Kindly guide me, to proceed further…!

Best Regards
Arul Jothi J