how to define a project with fixed begin and end dates

Hello
I want to do something really simple : I would like to define a project that will start on a given day (lets say july 1st 2022)  and end on another given day (lets say September 1st 2022)

NO MATTER WHAT ressources are affected to the project / activity and no matter the work assigned to each ressource : I always want this project to start on july 1st and end september 1st

I tried every possible way (using the planning modes)  I could think of but everytime I plan the project the planned begin and end dates are not what I want

Any idea on how I could do this ?

Regards

thanks for your reply

I already tried to use the "overbooking" possibility : it doesn't change anything

It is too bad because it is a very simple thing but very useful : in real life this happens often. For me not being able to do this will be a real problem and it is too bad because projeqtor is really a good tool

is there any way this can be implemented in the product as an improvment ? shall I enter a post in the improvment part of this forum ?

Regards