error during result analysis KKA3 execution- Cost element & in Controlling area & does not exist on &

Hi experts,

I´m getting the following error when trying to execute the Result analysis (transaction KKA3)

I am trying to execute period 9/2015 and I get the message saying that the cost element does not exist for the Controlling Area on 09.30.2015 but I have checked the cost element does exist for that date. What can be the reason for this message as the cost element exists?

Thank you in advance, will appreciatevery much your help,

Victoria