Updating the Fix Version on the plan causes to overwrite the Fix Version on Jira instead of adding a new value to the field

Issue Summary

When updating the Fix Version on Portfolio Plan for an issue and committing the change, it will overwrite the current value from Jira.
However, in Jira, you can have multiple Fix Versions on the field.

Steps to Reproduce

1. Create a plan based on a project
2. On Jira, create an issue and create some Fix Versions
3. Add two fix versions to the issue in Jira
4. At the plan, reload the information (calculate) and set a different Fix Version
5. Commit the change
6. On Jira, the information was replaced by the new value

Expected Results

The Plan should prompt to select an option to add a new value or overwrite all the information

Actual Results

The Plan overwrite the entire field and does not give an option to have multiple values on Fix Version (Release) field

Workaround

Currently there is no known workaround for this behavior. A workaround will be added here when available