is it only me not seeing it or you did not attach pictures/screenshots?

Hello Adam, my bad something went wrong when adding i guess.

OK, so you have activated object and want to change its value before starting depreciation? I think it will not work using Change acquisition value. 

I am not sure how you activated the object. If from Investment, you should deactivate it and then post additional acquisition voucher with relevant change. 
If from Import, you should rollback import and redo it with correct acquisition details

Hi Adam, it was booked via a M voucher and connected to the object. Periods are closed, so we can not book on 2025-02-01 (yyyymmdd) anymore. Strange thing is that in other environment i managed to do so with change acquisition value.

You were trying to do adjustment with July voucher date so you can do same with M voucher. After that you can still reactivate object with Feb Acquisition date. 

problem solved, we used the option below to create negative investment: