Fixing deployed Business Rules policy version

let's say we have version 1.18, which we want to fix, w/o changing version number (as you know, you can't modify published policy)

1. copy 1.18 deployed/published policy version and paste new policy (copy - paste policy version) - it will create 1.19 policy version
2. make neccessary changes to 1.19 policy version
3. publish - deploy 1.19 policy version
4. undeploy, delete 1.18 policy version
5. make a copy of 1.19 policy version (copy - paste policy version)
6. save 1.19 policy version
7. change 1.19 policy version number to 1.18, publish and deploy this policy
8. undeploy and delete 1.19 policy version