when you delete a process created by using the database, you need to delete the process in "stochastic processes" and the zr from "parameters&function". If you don't delete the process also from "data sources", the zr of the next process you create in the same file could be empty (not always). It would be useful if you could delete the process in data source just by eliminating the process in "stochastic processes".
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How to reproduce
create a procesess using database, delete the process and the zr and create another process