forecast accuracy caculate

Dear SAP experts,

I hope to caculate the forecast accuracy by article number for privious months at any time.

for example, today is 17th May, I want to caculate the forecast accuracy of 123456(article number) for April.

normally forecast accuracy = actual order quantity we got in April / forecast quantity in April.

So i hope to get these 2 kinds of data from SAP(ERP) at any time. are there any transactions that can implement this function?

thank you.