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Why does COPASI refuse to import an SBML file it just exported?

April 26, 2017copasi exported file import refuse SBML

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Why does COPASI refuse to import an SBML file it just exported?

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COPASI version prior and including COPASI RC1 contain a bug in the SBML export. If the user chooses to export a model that has the substance units set to “#” (items), COPASI will export an SBML file where the scale of the substance unit is set to 1 instead of 0. Since COPASI does not do SBML unit conversion upon import yet, it will refuse to read those files. In order to correct such a file, open it in a text editor and change the scale on the substance unit (in the tag) from 1 to 0. Versions of COPASI newer than RC1 will point you to this FAQ if they encounter such a file.