In this step you can define the media that are allowed for object links.
The medium indicates the kind of link (electricity, gas, telecommunications cable etc.) and you can define it freely.
You can enter the material number for an object link for informative purposes in the field provided.
You are defining a medium for a cooling system. Only one particular type of coolant is allowed in this cooling system, and so you enter the number of the permitted coolant in the "Material" field.
You should also supply a descriptive text for each medium, as this will be displayed in the associated transactions.
Define the media for your object links.