Saving the RRI spreadsheet function to ODF .ods writes the name ZGZ instead of RRI that is defined by ODFF/OpenFormula. See also http://docs.oasis-open.org/office/v1.2/cs01/OpenDocument-v1.2-cs01-part2.html#RRI
Fixed in master with http://cgit.freedesktop.org/libreoffice/core/commit/?id=8f9cb3dddd2ffe95ebd9934ddafc666a8df854bd
Change pending review for 4-0 as https://gerrit.libreoffice.org/1922
Eike Rathke committed a patch related to this issue.
It has been pushed to "libreoffice-4-0":
ODFF: write RRI as RRI, not ZGZ, fdo#60077
It will be available in LibreOffice 4.0.1.
The patch should be included in the daily builds available at
http://dev-builds.libreoffice.org/daily/ in the next 24-48 hours. More
information about daily builds can be found at:
Affected users are encouraged to test the fix and report feedback.