Internal Charge Numbers are not generated when reservations are created or imported into the system.

OPERA Control for Create Internal Charge Number is set to Off.

Set the OPERA Control for Create Internal Charge Number to On.

Internal Charge Number is not found when used with a posting from a third-party system.

Reservation is not active for posting.

Verify why the reservation is not active for posting. For example, the status might not be correct, or the Pre and Post Stay rules are not valid.