Promotion is applied to renewal orders of a subscription despite the promotion End date has passed.
Upon the subscription creation the initial version of the promotion with unlimited discount period was applied. Further the promotion was edited and discount period was limited. On subscription renewal the latest promotion version was applied but the promotion end date for the subscription was not updated and thus the promotion is still unlimited.
Such behavior was classified as the software issue PBAS-29953 was fixed in OBAS 4.5.5.
To resolve the issue, please upgrade to 4.5.5 as described in How to upgrade OBAS system to the latest available version.