how can we stop the negative sales and negative inventory,
all banks
@caamir, your post was moved to a new topic because it was unrelated to the one where you posted it. Please do not divert topics with unrelated questions. See FAQ.
You cannot prevent negative inventory balances. That is how Manager indicates a backorder situation. If you want to avoid them, check availability before creating sales invoices or receipts.
Your comment “all banks” is not clear. What do you mean? Bank accounts have nothing to do with inventory balances.