Before you add connections to a matrix model, you must select the connection types to be used.
Prerequisite
You have modeled at least one object in the column and in the row header.
Procedure
Double-click in an empty cell between two objects or click Display symbols and connections >
Display connections. The corresponding dialog opens.
Enter the first characters in the Enter text to filter field to reduce the amount of connection types displayed.
Move the mouse cursor over the connection type you want to add and click Show connection in menu.
Click Apply.
You have selected the connection types to be used in a matrix model.