NBV Formula calculating wrong Period wise Depreciation

Dear All,

Greetings, We have defined a formula (1/<Remaining Life>) for depreciation amount basis NBV. For the below amounts it is showing wrong calculations instead of expected. Kindly resolve the issue urgently

109,930,586.80-Cost of Asset

Acc dep: 76,599,061.65

NBV:33,331,525.15

Expected depreciation: 33,331,525.15/42( 3yrs 6 months pending life)=793607.74 for each period

Now system calculating : 9,721,694.84

Please advise suitable formula for our condition. Please note that same condition working for EBS

Regards,Rao