What does the error "REVEALED QTY SHOULD BE EQUIVALENT TO TOTAL QTY IN" mean?

REVEALED QTY SHOULD BE EQUIVALENT TO TOTAL QTY IN

The disclosed quantity feature is not allowed for use during the pre market hours [9:00am to 9:07am].

If an order is placed & disclosed quantity is entered, during the pre market hours, the order will be rejected & the above error will be displayed.