Error AA669 when changing depreciation key

Dear experts,

I met an error of AA669 when changing depreciation. The case is as below:

- I had run the Depreciation (AFAB) for Dec 2019. I opened the Fiscal Year of 2020.

And now I had to change the Depreciation key for some assets and re-run the depreciation for Dec 2019.

However, when I change the Depreciation key by AS02, the error message AA669 shows up (Fiscal year 2019 is already closed in Financial Accounting.)

What should I do to change depreciation key and re-run AFAB?

Thank you all in advance.