Cobol 6.2 : Support set to false in DFA

**What is the current problem**
**FOLLOWING OF #1459**
Support set to false in DFA

Cobol code to illustrate.
```cobol
TODO
```

**Technical**
Will be edited by a team member.
Implementation details with the chosen solution.

**How to test automatically**
Will be edited by a team member.
Only if our current automated tests doesn't handle this.
