drools-eclipse/org.drools.eclipse/src/main/java/org/drools/eclipse/reteoo/AlphaNodeVertex.java
public String getValue() {
        AlphaNodeFieldConstraint constraint = this.node.getConstraint();
        if (constraint instanceof MvelConstraint) {
        	MvelConstraint mvelConstraint = (MvelConstraint) constraint;
        	FieldValue field = mvelConstraint.getField();
            return field != null ? field.toString() : null;
        }
        return null;
    }
public String getValue() {
        AlphaNodeFieldConstraint constraint = this.node.getConstraint();
        if (constraint instanceof MvelConstraint) {
        	MvelConstraint mvelConstraint = (MvelConstraint) constraint;
        	FieldValue field = mvelConstraint.getField();
            return field != null ? field.toString() : null;
        }
        return null;
    }
Constraint field string

@return field string