Convert real work in cost

Hello,
I've got a project and an activity. I wnated to call for an externe in order to help me in that project. For instance in his function "F1' i set default cost to 150€ (i assume it's the cost per day ). But when this externe enter real work ( 9 days at the moment)on the activity the cost of the project doesn't change while it should have been 150*9. Am i doing something wrong?

here's the allocation of the extern and his function

Never mind I just had to relog and changes were applied