If you need to dispute a transaction, make sure to first contact your bank. Then wait the 3-5 days for the negative transaction to appear on your credit card statement.
You can then add the positive charge and the negative charge to the report.
Please note you will need to fill out all the details for the expense line to save and be submitted with the report.
If you have any questions about credit card charges, please make sure to contact your internal help desk and your bank first.