How to get selected field when creating task in JIRA from own plugin

[zodor]

I have created an own plugin using Atlassian SDK that fetches data from an API and populated a select-list in a JIRA Task. This works perfect. It works like this.

The plugin is created by the command:  atlas-create-jira-plugin

Whenever I change the selected itim in the CUSTOMER select-list it triggers my java code and updates the FLOW select-list with new options from the API.

The Code that is triggered:

...
import com.atlassian.jira.issue.customfields.impl.SelectCFType;
...

@Override public Map<String, Object> getVelocityParameters( Issue issue, CustomField field, FieldLayoutItem fieldLayoutItem ) {
.....
}

This works perfect when you clicks Create Task, or when you click Edit Task. In edit task whenever I change the CUSTOMER list it triggers the code and updates the FLOW list....

BUT, when the task is newly created and the java code has initially updated the select-list for the first time and I have NOT saved the task-popup window, it will does not trigger my code when I select a new item in the CUSTOMER list.

How could this be accomplished. Somehow I need to have my CUSTOMER list trigger my java code: getVelocityParameters. Why does this work out-of-the-box in the Edit-mode, but not in the Create-task-mode?