Looping a Functional Chain in a LAB diagram

[SpaceEngineering]

We are setting up Functional Chains for a LAB diagram, but have trouble creating a “loop” in the chain. For example, how do we make a chain go from Function A to Function B, and back again from Function B to Function A (see example below).

We are working on (Team for) Capella 6.1, any help would be greatly appreciated!

[SamuelRochet]

Hi,

One possibility is to use a SFCD, but other scenarios are also likely to be available.

In the example below, it wasn’t allowed to create directly the back exchange from function2 to function1.
However, there’s no problem if you add a second ‘Involvement Function’ related to function1.