Mistakenly amortized an adjustment on a prior period asset - need to adjust and if possible make it

Hi,

An asset existed in the system from a prior period (May). In the month of June, client added a payable source line as a cost adjustment to this existing asset and mistakenly enabled the amortization check box. We need to be able to flip that adjustment to expensed adjustment.

We tried to adjust the asset but the "Amortize" checkbox seems to be dimmed/inactive and doesn't allow us to disable the checkbox.

Would appreciate the resolution or workaround in this case from the community.

Thanks!