It is fairly common that an hourly employee will be transferred into a monthly assignment. The HR action of transferring an employee creates a Miscellaneous (MSC) event. This type of event will not allow a user to make benefit elections or changes.
In the event that a transfer becomes eligible for benefits, it is best to create a manual ADM event. Be aware of the event date entered, as well as the benefit record number. If all other eligibility objects are in place, the event should allow the user to make benefit elections.