Tiago Pessoa WST

Hello, I am working with piChem and have three questions. First, is there a way to disable certain nodes on the selection P4F user data so that they are not included in the PyChem calculations in order to increase performance? Second, when I ran some tests with my model, I received the following error message: 'PHREEQC chemical reactions (piChem)::OnTimeStepConstraint(): Invalid time step length!' I have tried disabling the time series and using time series with values of 0.0001 [d] and others with 1000 [d], but this message continues to appear. Third, is there a way to automatically link the Boundary Conditions and the Initial conditions without using the GUI provided by piChem? I want to create one file for each node on my model, approximately 79,000 nodes, maybe using Python to send that link information to piChem.