SEM Allocations - How do you make the Distribution work by Period not ***?

Question

I have configured an SEM BPS Allocation function.
The function appears to work as expected except for the distribution values that are being used in the calculation. The distribution values being used are the cumulative total and not the period values.
E.G...........................................P1.............P2........Total
<b>Sender</b>
Sender Value............................100............200..........300
<b>Distribution Ratio's</b>
Receiver 1...................................1...............7............8
Receiver 2...................................2...............2............4
Receiver 3...................................7...............1............8
<b>Expected Results</b>
Receiver 1.................................10.............140........150
Receiver 2.................................20...............40..........60
Receiver 3.................................70...............20..........90
<b>Actual Results</b>
Receiver 1.................................40...............80........120
Receiver 2.................................20...............40..........60
Receiver 3.................................40...............80........120
Can anybody tell me what setting I am missing to tell the distribution to use period results rather than cumulative results?
Many thanks

Answer 1

In the planning level I am using fiscal year and posting period. The posting period was set to be periods 1 to 12.
In the setup of an assessment function there are 4 input areas:
Sender - where I am choosing a sender cost center and identifying a secondary cost element.
Receiver - where I am identifying the cost centers to receive the assessment and the same secondary cost element (to be the same as R/3 assessments).
Trigger - identifying the range of cost elements where the original costs are held on the sender.
Distribution - where I identify the statistical key figures where the values are held to calculate distribution ratios over the receiving cost centers.
I have attempted to insert posting period into the assessment structure, but have been getting a message that posting period is included in a higher method, which did not appear to be the case.
In reviewing this while answering your initial questions, posting period is now able to be input into the structure, and the assessment appears to be working.
Thank you for trying to help.
This appears to be one of those strange items where some previous configuration had not cleared in the relevant tables.