I'm surprised that   data is already imported via SQL but ^myclassD has no content.
So take a look into the related generated class:

Storage Default
{
<Data name="DirDefaultData">
<Value name="1">
<Value>%%CLASSNAME</Value>
- - - - - -
after all properties
</Data>
<DataLocation>^oex.DirD</DataLocation>
<DefaultData>DirDefaultData</DefaultData>
<ExtentSize>986</ExtentSize>
<IdLocation>^oex.DirD</IdLocation>
<IndexLocation>^oex.DirI</IndexLocation>

 <IdLocation> is the one to go for
with all the new Storage strategies (columnar, sharded, ...  )
This might be quite an exotic global name and rarely the traditional.

I was right. 
My 7* review in OEX is still blocked by OEX censors, and your stars are suppressed.
24hrs are promised for reviews in OEX.

Just found it published now  [2026-01-04 13:18:45 UTC]

Using methods inside the class instead of
The external MAC routine in the original code is an elegant and valid approach