How can I verify allocation rule calculation output/see intermediate results/source contribution?

Summary:

I am looking for a report which displays the calculation path / intermediate results for every output cell of EPCM allocation rules. Basically a deeper look in how EPCM calculations.

Content (required):

Here is a simple example:

How can a controller quickly verify that the 85 for LV0 Member 1 is the right value and the system / rule has no errors. Even when the controller can look into the Rule: Allocation Room Expense there seems to be no overview of the intermediate results / calculation path. So when one needs the whole calculation path they go back to excel...

I can think of two report formats to solve this issue but have not found anything like that in EPCM.