It seems that nested {{#each}} iterators are not yet supported in PDF templates. For example, the following construct does not work with the "Sales Orders" entity in espodemo:
{{#each quote}}
Amount: {{amount}}
{{#each opportunity}}
Opportunity: {{name}}
{{/each}
{{/each}}
{{#each quote}}
Amount: {{amount}}
{{#each opportunity}}
Opportunity: {{name}}
{{/each}
{{/each}}
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