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Your network save location is probably a windows share. Windows shares don't generally handle file wrappers (such as OmniPlan and OmniGraffle typically save) very well. In the latest OmniGraffle, there's a checkbox on an inspector to make the file into a flat file instead of a file wrapper.

In OmniPlan, there is no such option. To get around this you could save locally, right-click it and choose "Compress" or "Create Archive" (10.5 or 10.4). Then take that zip file and put it up on your windows share.