how to remove string?

[Richard]

Code:

EXPORT LIST_1:={1,2,3}; 

ID;
NUMBER;
VAR;

EXPORT CHANGE()
BEGIN

NUMBER:=1;
ID:=EXPR("'LIST_"+NUMBER+"'");  // ID  =LIST_1
VAR:=EXPR("'LIST_"+NUMBER+"'"); // VAR =LIST_1

EDITLIST(EVAL(ID)); // LIST_1:={ 1,2,3 } CHANGE LIST_1:{100,200,300}

// CHECK THIS GLOBAL VARIABLE IN MEM> USER VARIABLES> LIST_1
// You will see that the change is not saved
END;