FA & Values under Revaluation Amortization

I have an asset Cost of £29,000 with a 19-year life span in & date in service was 2020 & can see its STL depreciation I have checked the depreciation manually & can see it matches the application. There was in 2022 a revaluation increasing the asset cost by 9,000 to a cost of 38,000 & in 2024 another 9,000 Revaluation increasing the asset cost to 47,000 – also noting that the Depreciation values were updated accordingly & all appear to be correct. My lack of understanding is around a value present in the 'Revaluation Amortization' field (via