From English - German Ding/FreeDict dictionary ver. 1.9-fd1:
operational expenditure /ˌɒpəɹˈeɪʃənəl ɛkspˈɛndɪtʃə/ (OPEX /ˈəʊpɛks/)
Betriebsausgaben <pl>, betriebliche Aufwendungen, Betriebsaufwendungen <pl>, erfolgswirksame Aufwendungen, erfolgswirksamer Aufwand
Synonyms: business expenses, operating expenses, business expenditures, current expenditure, revenue expenditure
see: spending, expenses, expenditure, expenditures, extraordinary expenditure, nominal expenditure, actual expenditure, unavoidable expenditures, necessary expenditures, obligatory expenditure, entertainment expenses, social spending, advertising expenditure, interest spending, additional spending, additional expense, additional expenditure, compulsory expenditure