2441574 - Error message RETMFI 100 when saving a RE-FX contract

You are processing a contract with conditions in foreign currency. When you check the data or try to save you get the message RETMFI 100:

"Postings: conditions in foreign currency require currency translation rule"

The long text of the message indicates to specify a currency translation rule in the posting term assigned to the foreign currency condition. Although the company code is activated for conditions in foreign currency and currency translation rules are defined in customizing the field "Currency Translation Rule" is not visble in the posting term. 

RETMFI100, XX01, foreign currency, currency translation rule, CTRULE Fremdwährung, Währungsumrechnungsregel , KBA , RE-FX-CN , Contract , RE-FX-CF , Conditions and Cashflow , RE-FX-OR , Offer and Rental Request , How To