Is there a way to exclude journal source 'Spreadsheet' from Funds Reservation ?

Summary:
While importing the Journals via Spreadsheet the users sometime use the wrong Future Enterable Period, since we have defaulted 'Submit Journal Import and Posting' option on the Spreadsheet to eliminate the Manual Posting Process these Journals with Incorrect date Try to get posted and end up in error because the Future Periods are only Future Enterable.

Since the Funds are reserved for these Journals in a Future Period we cannot delete them. The only way (we think) is to open the Future Enterable Period, Unreserve the Journal and then Delete the Incorrect Journal.

But opening Future Periods is not viable because when closed we cannot make these Periods - 'Future Enterable' again. For the Business to operate smoothly we require these Future Enterable Periods for other modules.