3814343 - Why can't I itemize an expense on a submitted report as a processor?

I am trying to fix an incorrectly itemized expense entry as the Expense Processor for my company- but do not see the "Itemize" button available. How can I itemize an incorrectly submitted expense before making my final accounting review approval?

Itemization options for line-item expense entries on submitted reports/claims , KBA , CON-EXP-ADM-WFL-WL , Workflow , Problem