When a tickler has invalid data in the "Date (YYYYMMDD)" field, Sierra's nightly tickler process will fail and any ticklers on order records not already processed will not be sent. This failure will keep happening every night until the problem is discovered.

For example, dates entered with dashes separating the elements ("YYYY-MM-DD") or with additional characters following the date ("YYYYMMDD - Note text here") will cause this kind of failure.

In the absence of an easy way to search for invalid data in the tickler date field (e.g., Create Lists), it would be very desirable for Sierra to validate user input to ensure that invalid tickler dates cannot be entered in the first place. This would prevent such failures before they can happen.