I.e. on https://petab.readthedocs.io/en/latest/documentation_data_format.html#condition-table The `NaN` case is listed for `speciesID` but not for `compartmentID` and `parameterID`. It is unclear what happens here, but I assume the initial values of the model should be taken. The sentence > the values will override any parameter values specified in the model. reads for me, that you have to set the `NaN`. See also discussion in https://github.com/AMICI-dev/AMICI/issues/1796