European Union (Withdrawal) Bill

I have a quick question about financial services legislation and deficiencies. I want to get it clear in my head, as a non-lawyer, that deficiencies would not cover material policy changes. For example, European banks, including British banks, currently do not have to hold any capital against sovereign debt issued by EU member states. Changing that could be considered to be dealing with a deficiency, because we will no longer be a member state, but it would be a policy change. Will the Minister confirm that that sort of amendment would be picked up and would go through the affirmative procedure?