Relation with another add-on

[FoxSecrets]

I am trying to build a relation from addon1 to addon2 (one to one), but it's not working. Something missing on my configuration?
On the example below, what does 'Category' relation refers to, can be any name? Is my 'entity' correct to point to another addon?

ADDON 1
Code:

// ...
    $structure->columns = [
      'product_id'   => ['type' => self::UINT, 'autoIncrement' => true],
      'product'        => ['type' => self::STR, 'maxLength' => 50, 'default' => '']
      'category_id'  => ['type'...

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