Description of problem:
GRE manifests write-only behaviour for certain rule features. It has specific UI controls for calls on global variables, formulas, freeform DRL etc., however after saving and reopening the rule, the controls look different and prevent editing affected parts of the rule.

Version-Release number of selected component (if applicable):
ER3

How reproducible:
-

Steps to Reproduce:
1. add java.util.ArrayList to project imports
2. define global variable of type java.util.ArrayList
3. open any Guided Rule, import ArrayList
4. add to RHS:

• "Call method on <globa_list>", call clear()
• "Append <bound variable> to list: <global_list>"
• "Modify <bound variable>", set a string field value to "Hello " + "World!"
  5. save, close, reopen

Actual results:
Global calls broken, cannot change the original values. Formula input field changed to literal value input.

Expected results:
After reopening the rule, guided editor should provide exactly the same controls that the user added before closing the editor.

Additional info:
See attached screenshots for illustration.