Here's my situation:

The UDS is on the Pre-Totals event of S/O invoice header and I am trying to access a field in the "AR_PaymentType" table. I would appreciate if anyone could see by blunder in any of the 4 methods I describe here.

Methods I've tried:

1. The oBusObj.GetDataSources() method indicates that "PaymentType" is a child of the invoice header, but the statement:
   

   Set oPaymentType = oBusObj.AsObject(oBusObj.GetChildHandle("PaymentType"))

   returns an error "Wrong number of arguments or invalid property assignment"
2. If I separate the combined statements above into two:
   

   oPaymentType = oBusObj.GetChildHandle("PaymentType")
   retVal = oScript.DebugPrint(SCRIPT_ID & "oPaymentType = " & oPaymentType)
   	
   Set oPaymentType = oBusObj.AsObject(oPaymentType)
   retVal = oScript.DebugPrint(SCRIPT_ID & "oPaymentType = " & oPaymentType)

   the GetChildHandle method above returns oPaymentType = 100078 (which matches the variable "coPaymentTypeChild" value in a debug dump),
   but the Set statement gets the same error as in #1 above: "Wrong number of arguments or invalid property assignment".
3. I tried using the existing variable "coPaymentTypeChild" directly in this statement:

   oPaymentObj = 0
   retVal = oBusObj.GetValue("coPaymentTypeChild", oPaymentObj)
   retVal = oScript.DebugPrint(SCRIPT_ID & "oPaymentObj = " & oPaymentObj)
   if oPaymentObj <> 0 Then
   		Set oPaymentObj = oBusObj.AsObject(oPaymentObj)

   the DebugPrint show oPaymentObj as 100078 (again, matching the variable "coPaymentTypeChild" value in a debug dump),
   but the Set statement gets an error "Invalid/Unknown property name, Wrong number of arguments or invalid property assignment (err/ret=2/0)"
4. My final attempt is to access the "AR_PaymentType_Bus" table directly and "SetKey" to the specific PaymentType with both of the following statements (separately):
   

   Set oPaymentObj = oBusObj.AsObject(oBusObj.GetObject("AR_PaymentType_bus"))
   Set oPaymentObj = oSession.AsObject(oSession.GetObject("AR_PaymentType_bus"))

   Both these statements get the error message "Invalid/unknown property name, Wrong number of arguments or invalid property assignment (err/ret=2/0)"