[RSS Feed/News] Relation with another add-on

[XenForo]

I am trying to build a relation from addon1 to addon2 (one to one), but it's not working. Something missing on my configuration?
Some questions:

• On the example below, what does 'Category' relation refers to, can be any name?
• Is my 'entity' correct to point to another addon?
• Does the recording order matter?

ADDON 1
Code:

// ...
    $structure->columns = [
      'product_id'   => ['type' => self::UINT, 'autoIncrement' => true],
      'product'        => ['type' => self::STR...

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