Stock Adjustment Approval workflow in MIGO

Hello Experts,

I need to create a approval workflow for stock movements made ( for receipts without PO mov type 501, 503, 505, withdrawal for scrap from stock 551,553,555) in MIGO.

1.There should be a workflow mail triggered to the mail box of the person responsible for approval.

2.For negative stock postings, i need to have them blocked until approval.

can you please tell me which is the best way to achieve this functionality?

Is it advisable to have a two step process, like moving the stock to a different stock stype and then moving it to required stock type after approval?

Is there a one step process possible?

Thanks