[Case to Invest to Case] Cyclic relationship bug

[Lhorus6]

Description

Prerequisite knowledge:

• On the platform, a Task "contains" a Case
• When you use the "Add to a container" button on an investigation, you create "contains" relationships between the container (the "from" of the relationship) and the nodes of the investigation graph.

Use case:

I have a Case to investigate. To do this, I use the "Start an investigation" function in the knowledge tab to rotate on the elements contained in my Case. Once I've finished my investigation, I want to re-import everything I've found into my Case, so I use the "Add to a container" function to import it back into the initial Case (the one from which I started the investigation). Here, the error appears.

Why the error appears

1. I have tasks in my Case, so I have relationships : Task "contain" my Case.
2. When I "Start an investigation" these Tasks end up as nodes in my investigation
3. When I want to re-import the data from my investigation into my Case (with "Add to a container"), I try to create Case "contains" [All nodes in my invest graph] and therefore I try to create Case "contains" Task.

As I already have Task "contains" Case and I'm trying to create Case "contains" Task -> Cyclic relation error

Environment

5.11.13

Reproducible Steps

1. Create a Case A
2. Add some task
3. Start an investigation from this case (you will see the task as node of your investigation)
4. Click on "Add to a container" and choose your Case A
5. Error occurs

[Lhorus6]

This issue comes from the issue #4891 that had two bugs in one