How to map constant value using value mapping
In my scenario i had map constant value like vendor number to field PARTN of segment EIEDKA1 in idoc oders05 . But now functional is telling me that vendor number can't be constant, it can be changed on testing and production system. And suggested me to use value mapping. But in value mapping feature i have to mention source field and destination field both. But here source is constant that only i have replace with value mapping.
How can i do this mapping???? Please help me.