Memorized payee list - I don't want it to add a new line for category for existing payees

Example: I have "Amazon" as a memorized payee. I have it locked, with the category blank, and the amount blank. When I add a new transaction, I manually choose the category (for example, "groceries") and enter the amount (for example, $35.00). When I go back to the memorized payee list, it's created a new entry under "Amazon" with "groceries" as the category and "$35.00" as the amount. Because the payee "Amazon" is locked, when entering subsequent Amazon transactions, the category is always blank and the amount is zero (as I want them to be). But ... is there a way to keep the memorized payee list from adding new entries every time I manually choose a category for new transactions?