I want to implement certain automation when specifying a child tab for a custom field.

[dongdong]

When I specify the child value of the custom field of an issue, I try to send a Slack message corresponding to the child value, but the entire custom field is specified and only the child value is not specified separately.

for example {{issue.customfield_10991.child.value}},  When you do this, an error message appears saying that the value cannot be found.

[Evgenii]

Hi, @dongdong 

Welcome to Atlassian Community!

What customfield type are you using? I checked functionality of standard cascade select field, and it is possible, to get child value with this type of smart value.
Made a small example for testing, and it works:

[dongdong]

hi evgnii. 

Thank you for your kind reply.

However, the automation rule also works on other child values ​​that I specify, resulting in additional messages.

For example, set the child values ​​of Wi-Fi connection and Wi-Fi login in the Wi-Fi field. If you apply each child value of Wi-Fi connection and Wi-Fi login to automation and register a Slack message, If you create a Wi-Fi connection issue, whether the Wi-Fi field value takes precedence, not only a Wi-Fi connection-related message but also a Wi-Fi login message is sent.

How can I ensure that when I click on the wifi-wifi login item, only the automation corresponding to that item operates? I only have project administrator privileges and do not have Jira Admin administrator privileges.