Fix: The lock was not working because:

1. The Account Types sent were sqlqueries and not integer literals
2. Voucher Types and Account Types were being compared to VoucherTypesSelected and AccountTypesSelected objects and not their ids.

version_bump.sh

@@ -2,7 +2,7 @@
 parent_path=$( cd "$(dirname "${BASH_SOURCE[0]}")" || exit ; pwd -P )
 cd "$parent_path" || exit
 
-if [ 1 -ne "$#" ]
+if [ 1 -eq "$#" ]
 then
   echo "Version bump to $1"
   sed --in-place --regexp-extended 's/"([0-9].[0-9].[0-9])"/"'"$1"'"/g' brewman/brewman/__version__.py