The Posting Rhythm block appears when the Rate Management - Rate Code Posting Rhythm in OPERA controls is Active.
When configuring Package Code, in the Posting Attributes panel, the posting rhythm is used to determine the frequency of the package posting. OPERA provides a variety of posting rhythms. Most posting rhythms are based off of the actual arrival date of the reservation.
When configuring the Advanced Posting Rhythms, you can configure dates when a guest is eligible for free nights based on the length of stay of the reservation. For example, a promotion may be offered for the month of June where guests who stay 7 nights will receive 2 free nights. Multiple posting rhythms can be defined per rate code, however there cannot be overlapping dates.
Parent topic: About Rate Codes