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MAYBE WE SHOULD ALSO CREATE AN EXAMPLE WITH A CALCULATED NUMBER FIELD AND LINK THEM
Use case
In the following example we want to display in the parent issue the sum of a number field in sub-tasks. So as soon as the value in a sub-task changes, the parent value will also automatically be updated.
Field Changed Event
Create a new rule and name it appropriately.
Providing a description will help you to identify what the rule does but this step is optional.
Add a Trigger → Field Changed Event
Fields*
Choose your custom Number Field
Changed to*
Choose Any value
Issue Selector
Add Selector → Issue Selector
Target Issue(s)*
Parent Issue
Update Field
Next to the Issue Selector click on Add → Action → Update Field
Field*
Choose your custom Number Field
Update to*
Choose Value returned by parsed expression
Parser Expression*
Set it to Advanced and enter the following Parser Expression
sum(fieldValue({issue.cfnnnnn}, subtasks()))
nnnnn is the field code for the custom number field to be summed up.
Screencast
This is how the configuration above should look on your screen