disaggregations v/s breakdown

Given the total balance amount - e.g. receivables - I think you would ask for a breakdown - which would be a list of balances from the receivables ledger. Given a total amount of something like repairs and maintenance, I think you would ask for a breakdown too. But if, typically looking at sales/gross profit in analytical procedures, disaggregation suggests that your are looking for something that has been aggregated. For example, the aggregation of sales by product line/geographic location/division, etc. I think disaggregation has a narrower and more specific meaning of restoring the make-up of a total into constituent parts/sub-classifications.

You're not going to use them interchangeably if you reserve the use of the word disaggregated for the description of analytical procedures.