Getting SCOPE_IDENTITY() from SQL SERVER

Hi,

In a Business Operation i have the following code.

I need the identity of the latest row inserted in a table in MSSQL.

i Have the following code:

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set insertmaster= "INSERT INTO dbo.dataMasterArchive(deviceToPatientLogID) values (?)"

set tSC = ..Adapter.ExecuteUpdate(.nrows1,insertmaster,pRequest.deviceToPatientLogID)                                
$$$ThrowOnError(tSC)

set sql ="SELECT SCOPE_IDENTITY()"
set tSC = ..Adapter.ExecuteQuery(.tResult,sql)
$$$ThrowOnError(tSC)

set maxID = tResult.Get(1)

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the result of maxID  after the above is NULL.

what am i doing wrong?.

Thanks