Question-and-Answer Resource for the Building Energy Modeling Community
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It does sound like there are insufficient fields in the IDD for IDF Editor to properly read it. What you'll need to do is find the "Energy+.idd" file in your E+ installation and open it in a text editor. Be careful if you are on Windows, I'm not sure Notepad will work for this. Search for the string "Schedule:Compact", and not that there's a line in there that says:
\extensible:1 - repeat last field, remembering to remove ; from "inner" fields.
This is telling you that the object is extensible one field at a time. Other objects have to be extended in chunks of multiple fields. If you scroll down to the end of the object, you should see a line like this:
A4488,A4489,A4490,A4491,A4492,A4493,A4494,A4495,A4496,A4497,A4498,A4499,A4500; \note fields as indicated
What you're going to need to is to delete that ';' and add a A4501 etc. after this line (and make sure you end it all with a ';'). You'll probably need to add a lot of fields.
You might want to consider using Schedule:File instead of Schedule:Compact. Schedule:File isn't presently supported by OpenStudio, but since you can edit those files with just about any spreadsheet program it might be worth your while to translate your schedules into that format.
