From In-Portal User Manual

This tab contains a list of all relations of this article. To create a new relation, click the ‘New' button (two opposite green arrows with a little sun). This will pop up an item picker, where you can choose one category or item of any module that supports relations.

• Relation ID – this is a read-only field, the internal system ID of the relation, guaranteed to be unique throughout the system. It is blank when a new relation is created.
• Item – this is a read-only field, displaying the name of the item that you are creating a relation to, and its type. In the current version, articles can be related to categories, links (if In-link is installed) and topics (if In-bulletin is installed).
• Type – this field designated the type of the relation. A ‘reciprocal' type denotes a two-way relation, and ‘one way' – a one directional relation, from the article to the item.
• Enabled – this field is the status flag of the relation.
• Priority – this field is the numerical priority of the relation.