Here is the script and the error I receive.

'CM_UDTMaintSelect_UI
'CM_UDTMaint_Bus
'CM_UDTMaint_UI
'CM_UDT_Svc
'
oUDTMaint = 0
oUDTMaintUI = 0
custDiv = ""
custNo = ""
searchUDTCust = ""

retVal = oBusObj.GetValue("ARDivisionNo$",CustDiv)
retVal = oBusObj.GetValue("CustomerNo$",custNo)

searchUDTCust = custDiv & custNo

searchUDTCust =Trim(Cstr(searchUDTCust))

'not sure how to pass this to CM_UDTMaintSelect_UI

if Not(IsObject(oUDTMaintUI)) Then
Set oUDTMaintUI = oSession.AsObject(oSession.GetObject("CM_UDTMaint_UI","AR_UDT_CUSTOMER_GATE_INFO"))

If oUDTMaintUI <> 0 Then
Set oUDTMaintUI = oSession.AsObject(oUDTMaintUI)
End if
End if

retVal = oUDTMaintUI.LoadGrid "GD_Lines"

Here is the User Defined Table  Maintenance screen with the Selection screen open. I would like to open UDT Maint and pass the searchUDTCust value from the script to the UDT Selection field Customer_ID 

If anyone can offer assistance on this it would be greatly appreciated.

Just stumbled across this post from a while ago. I assume you probably fixed it by now but that type of error usually is typically related to compile issues than something with the code.

Any time you pass arguments to a property/function/method and you are setting it equal to something, you need to enclose those arguments in parenthesis.

retVal = oUDTMaintUI.LoadGrid "GD_Lines"

needs to be:

retVal = oUDTMaintUI.LoadGrid("GD_Lines")


unrelated to the error, but this would probably turn into a run-time error after you fixed this one, any time you use the "Set" keyword, you are making an "Object" variable, which means it would never be equal to 0..

    Set oUDTMaintUI = oSession.AsObject(oSession.GetObject("CM_UDTMaint_UI","AR_UDT_CUSTOMER_GATE_INFO"))
    
    If oUDTMaintUI <> 0 Then
        Set oUDTMaintUI = oSession.AsObject(oUDTMaintUI)
    End if

so the above statement should look like this:

    nUDTMaintUI = oSession.GetObject("CM_UDTMaint_UI","AR_UDT_CUSTOMER_GATE_INFO")
    
    If nUDTMaintUI <> 0 Then
        Set oUDTMaintUI = oSession.AsObject(nUDTMaintUI)
    End if

In your case, your variables beginning with an "o" should refer to it being an object of some sort. The first line would be returning a number, so you should begin those variables with "n" (or i/int or whatever you're using to distinguish these). If you're going to use type prefixes on your variables you should stay true to them. I just stick with n (number) because l (lower case "L") doesn't look right for me when being specific on the actual number type.