FMU created by Simcenter Amesim and then reimported for validation can yield different results if the initial conditions are not set appropriately as their default value is 0.
When a reimporting FMU created using Simcenter Amesim back inside Simcenter Amesim for validation under certain conditions it is possible to observe a potentially contradictive behaviour: results between native Simcenter Amesim model and Simcenter Amesim model with imported FMU diverged despite the same inputs. Such issue is observed due to initial conditions that do not match. As a default, Simcenter Amesim uses '0' as an initial condition, thus if this is not true (if initial value is different) - results may diverge.
According to FMI specification it is user’s responsibility to ensure such compliance: