You will need to map each of your unmapped transaction messages and run the Update Unmapped Transactions process one at a time for each message that you mapped.
  1. Go to Financials > Review Unmapped Transaction Messages
  2. Click Update Unmapped Transactions on the left side of the page under Related Tasks
  3. Click Start Process under Tasks
  4. Click Deselect All, then check only one box for a transaction message that you have already mapped
  5. Click Start