A warning control budget message when user override in payable invoice

Summary:

A warning control budget message when user override in payable invoice

Content (please ensure you mask any confidential information):

Override account will not reserve any budget amount. Funds are always reserved for the original account on the invoice, regardless of which account is actually used for accounting. In order to alert user, there is an existing enhancement with development to add a warning message when user override that it will not release funds from old account and reserve on the new account."
Where can I set up this alert for user?

Version (include the version you are using, if applicable):