The Items List window should be displayed. (To find the Items List window)
You should start the item number with a backslash (\). Item numbers that start with a backslash won't print.
You also should give the item a name and number of "\reimburse" so the purpose of the item is easy for you to remember.
Review the income account that appears next to "I Sell This Item"; if you want to use another account to track income from reimbursements, enter or select that account.