RTC 4.x attr. customization: Need help to get a calculated value based on the values set in two other attributes

Hi,

Let's say I have a work item type = "CustomType" with the following attribute configuration:
Attribute A: integer  - defaulted to "0" and with validator = "number greater or equal than 0".
Attribute B: enumeration, with possible values: Pass, Fail, N/A, Not Assessed - defaulted to "Not Assessed"
Attribute C: small string, having dependency on Attribute A and Attribute B and based on a "Script Based Calculated Value" provider.
This is the logic I have followed to build the provider:
if Attribute A = "Fail" or Attribute B = "Pass", then Attribute C = Attribute A,  else if Attribute B = "N/A", then Attribute C = "0"
And here is the script code I used to build "my_Provider":

dojo.provide("com.example.my_Provider");

(function() {
    dojo.declare("com.example.my_Provider", null, {

        getValue: function(attribute, workItem, configuration) {
                
        var BAttribute= configuration.getChild("BAttribute").getIdentifier();
        var AAttribute= configuration.getChild("AAttribute").getIdentifier();
      
        if (BAttribute == "Fail" || BAttribute == "Pass") {
            return AAttribute;
        } else {
            if (BAttribute == "N/A") {
                return 0;
            }
        }
            
        }
    });
})();


After saving the configuration, if I performed the following steps:
Scenario 1:
1) Created a work item based on type = "CustomType"
2) Entered a valid number on Attribute A, e.g. "5"
3) Selected "Pass" on Attribute B
4) Saved work item
5) Expected Result: Value displayed on Attribute C is 5" (= value entered on Attribute A)
    Actual Result: Value displayed on Attribute C is blank

Scenario 2:
1) Created a work item based on type = "CustomType"
2) Entered a valid number on Attribute A, e.g. "8"
3) Selected "N/A" on Attribute B
4) Saved work item
5) Expected Result: Value displayed on Attribute C is "0"
    Actual Result: Value displayed on Attribute C is blank


Could you please tell me what am I missing?

FYI - I am using the RTC client on a jazz server v4.0.6

Thanks in advance!
Vicky