How to access target properties from SQL action in DTL Subtransform

Does any one could tell me how can I access the target properties from inside SQL in DTL Subtransform? For example, if I use the following statement:

SELECT ID INTO :target.SetIDPID  FROM firstlook.person WHERE  FirstName = 'Paul' - as said in documentation :

  SELECT Name INTO :target.Name FROM MainFrame.EmployeeRecord WHERE SSN = :source.SSN AND City = :source.Home.City

I get an Error: ERROR <Ens>ErrException: <PROPERTY DOES NOT EXIST>

But if I pass the value for a variable "SetIDPID" I can use it in a set action without any problem: 

SELECT ID INTO :SetIDPID  FROM firstlook.person WHERE  FirstName = 'Paul'

Product version: IRIS 2021.1
$ZV: 2021.1 (Build 215.3U)
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Discussion (1)1
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Do you initialize your target variable as an instance of an object that has Name property? The following snippet works for me

Class Custom.Test Extends %RegisteredObject
Property Name As %String; 

ClassMethod SQL()
    set target = ##class(Custom.Test).%New()
    &sql(SELECT 'TestName' INTO :target.Name FROM MainFrame.EmployeeRecord)
    write target.Name

Also, assuming you are running your test in console, you can issue write $zerror it will tell you which property is missing (could be related to something in the source rather than the target)