Sorting Repeating Group by another datetype

I wanna display the “Task” date type sort by “Work Package” and " Actibity" date type.

“Task” date type has “work Package” 's unique id and “Actibity” 's unique id, so i wanna sort those.

But, “Work Package” and “Actibity” can’t choice sorting the “Task” date type…

Is there any solution?

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