You cannot generate invoices for a project expenditure item. After running the Generate Invoices program for a billable expenditure item and active contract, the process completes successfully but without any billing, and does not provide any error logs.
The program's processing summary is as follows: Billing Event Errors 0
Ineligible Contracts 0

Successfully Billing Events Created 0
Ineligible Contract Lines 0
Billing Transaction Exception Errors 0
Ineligible Bill Plans 0
Billing Transaction Exception Warnings 0
Ineligible Associated Projects 0
Successful Billing Transactions 0
Ineligible Expenditure Items 0
Draft Invoice Exception Errors 0
Ineligible Events 0
Draft Invoice Exception Warnings 0
Successful Draft Invoices 0

What was the invoice method classification set to that caused this behavior? (Choose the best answer.)