We are trying to use RESTFUL service to send JSON data to Appian. The

... ""SessionId"": ""String"",
""Originator"": ""String"",
""UserRole"": ""String"",
""UserId"": ""String"",
""OperationName"": ""String""
                    },
                    ""gtwyReqDtl"": {
                              ""messageIP"": {
                                        ""EMPLOYEEDATA"": [{
                                                  ""EmpID"": "&ri!employee.EmpID&",                    
                                                  ""Name"": "&ri!employee.Name&",
                                                  ""Role"": "&ri!employee.Role&"                              
                              
                                                  }          
                                        }]
                              }
                    }
          }
}"

)

I am able to get a response when the fields are given hardcoded values within the quotes say “123” or when the rule inputs are individual fields and not a CDT.
When it is a CDT I get the below error –
Expression evaluation error at function 'httppostwithresponse' parameter 6 [line 22]: Invalid index: Cannot index property 'EMPID' of type Text into type Text

@ganeshp Though am not sure about the http integration you are doing, I am aware of the error you are experiencing. So I could give few suggestions which might help you in resolving the error 'Cannot index property 'EMPID' of type Text into type Text':
1. Please check if the rule input 'employee' (ri!employee) is able to accept the CDT input by checking if its data type is set to 'Any Type'.
2. Next to the above, make sure that the values are passed to the ri!employee. Some times there could be a chance that the values won't be passed to the rule inputs in a desired manner especially when we pass values to rule inputs by parameter because of the improper naming in parameter when invoking the rule.
3. Further make sure that the structure of ri!employee is simple and plain, but not an array of arrays which in-case requires an index in order to access fields (in this case the way you access the attributes in ri!employee is - ri!employee[1].EmpID, ri!employee[1].Name and so on).

Let's see if we could receive any valuable suggestions from other Appian practitioners.