Yes, “decide for” will solve the problem. So will “decide on inside decide on”. But, I wanted to know whether I can use “decide for” like “and/or” syntax in “decide on”.
Well, it does NOT look so according to the syntax/explanation:
Function
The DECIDE ON statement is used to specify multiple actions to be performed depending on the value (or values) contained in a variable.
(a variable means “one variable” as far as I can tell).
You could probably do some tricky programming using REDEFINE so that you could decide on one variable that actually contains tha value of two variables, but I don’t really see the point. A DECIDE FOR would be a lot clearer to somebody else who would read your source code.