Version Delta
The version delta helps to identify Test Cases that were added or changed in the current Version.
Existing Test Suites and Test Cases are copied from the previous Version to the current Version when it is created. When a Test Case is edited in the current Version, the “version delta” is automatically set to true. If no relevant changes are made, the user can set it back manually to false.
And for Test Cases newly created in the current Version, the “version delta” is also set to true by default.