How to restrict users to enter negative amount for a specific expense type?

Summary: we have created a new expense type for which business do not want users to submit the expense report for a negative amount. Is there a policy we can build to restrict users to enter negative amount for a specific expense type?

The options available with current policy configuration is to restrict report submission only for rates greater than or equal to zero.

Also audit rules with respect to expense type can have amounts greater than or equal to zero.

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