Change Values of Related Projects by using Custom Workflows Plugin

[AhoudAlten]

Hi there,

I'm wondering if there is a way of auto checking the check boxes in (Related projects (Edit project list)) based on a if statement of another custom field in the issue?

I've tried to do that by using the Custom Workflow plugin. But I couldn't get it to work. The following was my attempt by using the Custom Workflow Plugin:

Before Saving:
self.project_ids => ["5"]

This throws an error. Is there a way I can use the Custom Workflow plugin to change the values in the Related Project List?