How to reflect the change in the cost of a resource

Hi,

I have to take in consideration the change in the cost of some of my resources. Say for example: resource A will cost:
* 100 EUR / day from 1-Sept to 30-Sept
* 200 EUR / day from 1-Oct to 31-Oct

If I assign this resource to an activity for 40 days (20 days in Sept, 20 days in Oct), I expect the cost to be 20*100 EUR + 20*200 EUR
To modelize that, I used the start date / end date of the "Function" of this resource. I created a function with cost 100 EUR / day for resource A. Then I created new instance of same function for same resource A but with cost 200 EUR / day and start date = 1-Oct.
Unfortunately only the last value is considered and the cost for the resource usage is 20*200 EUR + 20*200 EUR.

Did I misunderstood this function? If yes, any help is welcome to modelise my change in cost (without creating 2 resources or cuting activity in 2 if possible )


Thanks !

Stephane

Thanks for your answer. In that case I face an issue because even when I run planning calculation, the planned cost uses the last value of cost / day regardless of dates.

I think I understood the way it works.
In my example:
1/ When I assign the resource
=> assigned cost = 40 * 100 EUR (daily cost of resource when resource is assigned to activity)
2/ When I calulate the planning
=> assigned cost = 40 * 100 EUR
=> reassessed = 40 * 200 EUR (latest daily cost)
3/ When I start entering real work allocation (say for example 10 days in period where cost = 100 EUR)
=> assigned cost = 40 * 100 EUR
=> real cost = 10 * 100 EUR
=> left cost = 30 * 200 EUR (if I have evaluated that 30 days remain)
=> reassessed = real + left

Finally, the assigned cost and left cost do not reflect the change in cost. Only the actual cost at the end will reflect the change in daily cost.

Does anyone confirm?
Stephane