I really appreciated a walk through of the calculation but I still can't get to the number that appears on Line 15 of the Schedule A-I.

Total cost of Items placed in service: $152,390

Total Federal 2023 bonus Depreciation: $ 0  (5.0 yr 200DB/HY depreciation was taken)

Basis for Depreciation to be taken in subsequent years: $152,390

Less 2023 current depreciation deduction: $(30,478)

Oklahoma Bonus Depreciation Adjustment on Form 511, Schedule A-I $20,072

I don't have a clue where this number came from

Any advice on where this number ($20,072) came from?