I don't think you'll find a short term for because, as you say, this is a long-winded, and inappropriate, attempt to apply the terminology of management accounting to financial reporting:

http://winfo1-www.uni-paderborn.de/download/pruefungen/muste...

I would translate your sentence along the lines of: 'currency effects are made up of those resulting from the translation of assets and laibilities and those arising from payment flows' or 'income and expenses' for 'payment flows' (I think 'payment volumes' doesn't quite work in English, except perhaps for banking, while 'volume of payments' is too macro and 'flow volumes' sounds like a water company).

A distinction is made between the two categories not least because they are usually accounted for differently, assets and liabilities generally being translated at year-end rates and income and expenses at the rate prevailing at the date of the relevant transaction or at an average rate for the period:

http://annualreport.deutsche-bank.com/2005/ar/notes/1account...