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They will bring you over to an AS-01 position to satisfy the lateral nature of a secondment, then they will act you up in an AS-03 capacity.
Ahh. Will they be paying me for the acting or will my old department do so?
I am currently doing this. I submitted my signed LOO for the acting to my old department and they enter it and continue to pay me. My old department then gets the cost of my new pay from the department I’m now seconded/acting at.