The line is queued for its next fulfillment task but the task isn't finishing, upstream of shipping. Think: reservation not possible, supply not available, or (for back-to-back/drop-ship) the supply order side hasn't caught up.
Waits for: the next orchestration task (scheduling/reservation/supply) to complete.
Checked Order Management and Fulfillment troubleshooting for Oracle Fusion, rewritten in plain words from publicly known practice and reviewed by a working consultant. Checked against the current release, Jul 2026. Navigation and behavior vary by configuration; verify in your own instance and test before acting.