Can not delete the "Expenses that can be added to reports"

[watac]

In Trave@, I tried to delete the reimbursed amount in "Expenses that can be added to reports" but it says I don't have permission. 
(Negative costs cannot be deleted.)　　System said　”Please　Contact the helpdesk"
How can I delete?

[KevinD]

@watac I can see you have a credit for a train, which should have been added to your report named: 八十二銀行青山支店

This report has the original charge of ¥7,810 which was an incorrect charge. So, to zero out that charge, the refund/credit should have been added to this report. 

However, since this report can no longer be edited, you will need to wait until you incur other business expenses on your AMEX card that have a total greater than ¥7,810. Once you do, add the negative amount AMEX charge to a report along with the other AMEX charges. 

Company card charges, no matter if they are negative, cannot be deleted.