protected function get_variation_parent_attributes( $attributes, $parent ) {
		$parent_attributes = $parent->get_attributes();
		$require_save      = false;

		foreach ( $attributes as $attribute ) {
			$attribute_id = 0;

			// Get ID if is a global attribute.
			if ( ! empty( $attribute['taxonomy'] ) ) {
				$attribute_id = $this->get_attribute_taxonomy_id( $attribute['name'] );
			}

			if ( $attribute_id ) {
				$attribute_name = wc_attribute_taxonomy_name_by_id( $attribute_id );
			} else {
				$attribute_name = sanitize_title( $attribute['name'] );
			}

			// Check if attribute handle variations.
			if ( isset( $parent_attributes[ $attribute_name ] ) && ! $parent_attributes[ $attribute_name ]->get_variation() ) {
				// Re-create the attribute to CRUD save and generate again.
				$parent_attributes[ $attribute_name ] = clone $parent_attributes[ $attribute_name ];
				$parent_attributes[ $attribute_name ]->set_variation( 1 );

				$require_save = true;
			}
		}

		// Save variation attributes.
		if ( $require_save ) {
			$parent->set_attributes( array_values( $parent_attributes ) );
			$parent->save();
		}

		return $parent_attributes;
	}