You can use the {ProjectWebUI} to troubleshoot ERB templates.
The {ProjectWebUI} provides two ways to verify the template rendering for a specific host:
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Directly in the template editor – when editing a template (under Hosts > Templates > Partition tables, Hosts > Templates > Provisioning Templates, or Hosts > Templates > Job templates), on the Template tab click Preview and select a host from the list. The template then renders in the text field using the selected host’s parameters. Preview failures can help to identify issues in your template.
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At the host’s details page – select a host at Hosts > All Hosts and click the Templates tab to list templates associated with the host. Select Review from the list next to the selected template to view it’s rendered version.