How to exclude negative transactions from the Amex corporate credit card feed in Oracle?

Organization Name (Required - If you are an Oracle Partner, please provide the organization you are logging the idea on behalf of):

Vermont Mutual Insurance Group.

Description (Required):

We have an integration with Amex Bank for corporate credit card feeds. During the import of the feed file, negative transactions—representing payments received from the company—are being reflected in Oracle. These payment transactions are increasing in number each month. What is the recommended approach to clear or handle these negative transactions in Oracle?

Use Case and Business Need (Required):

Enhancement Request / Service Request: 4-0000572948