update custom field

[Charlie]

We want to edit or update a custom field when issue linked is created.

I try this function or scheme but it always delete the previous values into the field.

what are we doing wrong please?

[Max Foerster - K15t]

Hi @Charlie 

do I understand correctly, that you want to keep the old field value and add "Issue xyz is used..." to your custom field?

Best, Max

[Curt Holley]

If so, what you need to do is, repopulate the Reused in field every time the rule runs. You can do this prefixing your current code with {{issue.customfield_10123}} where 10123 equals the "Reused in" field. You could use {{issue.Reused in}} but using the ID future proofs any name change. 
Put it at the top, start a new line and place your current content there. This way the field will build up with new entries with every rule run (on a given issue) rather than overwriting the current content with the new content.

[Max Foerster - K15t]

@Charlie , give a try to @Curt Holley suggestion as it will be the easiest way to append text to a field and keep us posted if you need further assistance :)

Best, Max