Subclass Property Retrieval

It looks like a problem of $THIS, if you check the documentation (here) you'll see that the relative dot (..) notation is preferred, in the same page you can see that <NO CURRENT OBJECT> error is produced by a bad reference of the object.

You can check the documentation about the relative dot notation here

Can you please provide here a small sample showing the issue.

$this is actually return the current class name instead of object if you're using inside ClassMethod. On the other hand if you use $this (It actually holds the object) So,  it returns object inside Method . Check the below sample code and output

ClassMethod thistest()
{
    write"$this inside ClassMethod: ",$this,!
    write"$this object check ClassMethod: ",$ISOBJECT($this),!
    set obj = ##class(User.NewClass1)..%New()
    do obj.thistest1()
}

Method thistest1()
{
    write"$this Method: ",$this,!
    write"$this object check Method: ",$ISOBJECT($this),!
}

LEARNING>d ##class(User.NewClass1).thistest()
$this inside ClassMethod: User.NewClass1
$this object check ClassMethod: 0
$this Method: 1@User.NewClass1
$this object check Method: 1

So. If you're trying to get the property value inside classmethod by using $this in $PROPERTY($THIS,propertyName) It throws  <NO CURRENT OBJECT> error . so you should use object for $PROPERTY or use this retrieval $PROPERTY($THIS,propertyName) inside method.