"I'm looking for guidance on customizing the behavior of the stock.picking module in my ERP system. Currently, when confirming a quotation, it creates a sale order along with a delivery slip, which generates a sequence code immediately. However, I want to delay the generation of the delivery slip number until the stock.picking state is 'done'. Essentially, The behavior of the sale invoice process where the sequence code isn't generated until the invoice is done. Additionally, I want the stock.picking state to remain as 'draft' until the delivery is done. Can anyone provide insights or steps on how to achieve this customization effectively? Any advice, code snippets, or pointers to relevant documentation would be highly appreciated. Thank you!"