This module asks for two files: sources file which should be a .csv file (tab separated) containing 3 columns and no headers ("compound id", "lower bound", "upper bound") , and bound file which should be a .csv file (comma separated) with 5 columns and no headers ("reaction ID", "reaction name", "reaction info", "lower bound", "upper bound")
If the exchange reactions containing the sources are already inside the SBML file, the file with the sources could be empty.