[Orch] issue with orchestration using business unit as an input due to the space in front

I'm building an orchestration using business unit as an input where my first step is a rule to validate the branch and it's working fine from the orchestrator studio when I input the branch manually. But when I attach it to a button in a form extension, it does not validate the business unit anymore and does not pass the rule.

I copy pasted the business unit in orchestrator studio and figured out that this was linked to the spaces in front of the business unit value. " XXX" instead of "XXX"

My rule "business unit = XXXX" does not allow me to put the spaces in front. How can I make the check pass?