Book Value not Gating 0 in useful life Depreciation Method

[SuriyaP]

hello Everyone,

I hope everyone is doing good.

I am facing an a issue.

in Assets accounting one assets is using Shift factor 3 and variable Dep. potation 50% useful life of assets is 15 years

Assets value is 111,842,735.75.(settled form AUC)

dep. start Date_15.08.2020.

Fiscal year April to march.

Scrap value of assets_ 1.

on that basis year 2021 Dep. is_9,355,976.75 and net book value is_102,486,759.00
on that basis year 2022 Dep. is_14,912,365.00 and net book value is_87,574,394.00
on that basis year 2023 Dep. is_14,912,365.00 and net book value is_72,662,029.00
on that basis year 2024 Dep. is_14,912,364.00 and net book value is_57,749,665.00
on that basis year 2025 Dep. is_14,922,922.00 and net book value is_42,826,743.00
on that basis year 2026 Dep. is_14,922,922.00 and net book value is_27,903,821.00
on that basis year 2027 Dep. is_14,922,922.00 and net book value is_12,980,899.00

that is right but in 2028 only 2,364,835.00 is Dep. calculated and book value is_10,616,064.00 remining after that no calculation done on my assets till fiscal year 2522,

after that system is calculating 

in 2523_1,915,878.00 and net book value is_8,700,186.00
in 2524_1,915,878.00 and net book value is_6,784,308.00
in 2525_1,917,361.00 and net book value is_4,866,947.00
in 2526_1,917,361.00 and net book value is_2,949,586.00
in 2527_1,917,362.00 and net book value is_1,032,224.00
in 2528_1,032,223.00 and net book value is_1.00

way that happening. I'm not aby to understand the system behavior.

kindly help me.