Entering partial call numbers in the range (Example: AF to AF) or exact beginning and end callnumbers (Example: AF ABB to AF ZUS) will result in no returned records. Entering full callnumber that match for beginning and end of range will export those records (Example: AF Woo to AF WOO).
Signed off on patch for master for this (I don't think 3.0 is being supported anymore).
Created attachment 3129 [details] [review] patch
Pushed, please test and mark resolved
This bug is mentioned in: Bug 5230: Call number ranges in export don't give expected results. http://lists.koha-community.org/pipermail/koha-patches/2011-February/013831.html