I am trying to change the wall construction dynamically using EMS to simulate the shifting position of a PCM layer within the wall based on a condition statement. However, I am encountering an issue related to the number of finite difference nodes. The following error message appears, even though both constructions have the same thickness and number of layers:

** Severe ** InitEMSControlledConstructions: EMS Construction State Actuator not valid. ** ~~~ ** Construction named = WALLPCMEXTERNAL has number of finite difference nodes =10 ** ~~~ ** While construction named = SISOPEN has number of finite difference nodes =0 ** ~~~ ** This actuator is not allowed for surface name = SIS, and the simulation continues without the override

I have tried using HeatBalanceAlgorithm: ConductionFiniteDifference and adjusting the timestep settings to control the number of nodes, but the issue persists, and results in illogical Surface Face Temperature

What could be causing this, and how can I resolve it?