How do you automatically set a radiobutton from an InputScript?

We have in this line of code:

radiobutton (7,4) "Issue to Factory Machine" [Movement type] "201"
We have tried to set V[Z_MB1A_MTYPE_201]
"1" also tried setting it to "==" ,"X" , etc

What is the correct format please?

Since the radiobutton refers to an entry field, please set the corresponding value into the entry field, e.g.

Default F[Movement type] "201"