Calculated field in workflow with Version 7.10.1

Wow I loooooove calculated fields. Wanted for all my life lol…

But either I don’t get it or there is something not working

I have two currency fields: “IP MRR” and “Autres MRR” (Autre = Other in French) and want to add them to Total MRR on save of Opportunity.

In my workflow log (at bottom of workflow view layout), I see that it has properly executed.

My formula is: { add (parameter1; parameter2) } and is mapped (assined) to my Total MRR field.

My params are Autre MRR $Raw value{P0} and IP MRR $Raw value{P1}

My workflow is set to run on “Only on save” and on “All records”

It has no conditions nor any relations.