Can I use HDL with Worker.dat to delete the current line manager on emp Assignment

Summary:

I need to do a mass update to employee records to delete the line manager info without adding a new one. The following is what we currently use to load manager changes, but I cannot find a way to clear the manager data without adding a new manager.

I have tried both of the following (blank, #NULL) and it just retains the current manager info.

How can I use an HDL to clear the Manager info on employee Employment/Assignment record?

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