Transactions show on the Unbilled Costs by Job report when they are not marked as billable, and should not normally show on this report.
A line on a transaction such as a Bill, Check or Journal Entry cannot be marked billable when it uses accounts of certain types, or items which use these accounts. Examples of this account type are Other Current Liability and Other Asset accounts. This situation can occur if the type of an account which was used on a billable transaction has later been changed to one of these account types. If a Customer:Job name is added to the name column on the same line as a liability account in a Journal Entry, it will show as Unbilled Costs.
Please follow the appropriate steps depending on whether you experience the problem with an account or an item.
Account used on transaction:
Item used on transaction: