In this configuration activity you are able to define maximum amount limit when you post cash journals. You could define it for all company codes in the client or only for a particular one. This is useful feature as in many countries there are government limits about the cash payments where you are not able to pay an invoice which is more than a certain amount.
IMG Path: Financial Accounting (New) -> Bank Accounting (Business Transactions) -> Cash Journal -> Amount Limit
When you open the transaction you could see a list of already defined amount limits if such such exist.
Following is the new entry screen.