Controllers writing into the same channel

In the OpenEMS Edge architecture in §4 Scheduler, it says “Later executed Controllers are not allowed to overwrite a previously written result.”.
However, I activated two controllers which write into the same channel (SET_CHARGE_POWER_LIMIT of the ManagedEvcs interface in my case), and it turns out that the second controller overwrites the value from the first controller. Now am I misinterpreting the statement from the documentation, or is it actually wrong?