01/01/1900 not longer recognized as "unknown date"

When the system was established to report the marketing status of centralized products, we were advised to use 01/01/1900 as a generic date for "unknown date", e.g. unkown date of "estimated date of reintroduction" after a temporal marketing cessation. Currently, I get an invalidation message that says that reintroduction dates "should be in the future" when I used that date.

Is there another "joker date" that I could use, has anything changed?
 

The date of 01/01/1900 was only to be used for the date of initial placing in the market for a presentation already in the market for which the company has no record on the date of initial placing in the market in a particular country. So, for old products for which there may be no records.

This date (01/01/1900) was not intended for an expected date of reintroduction, which cannot be in the past. The expected date of reintroduction should be provided to the best knowledge of the company at the date of reporting, accepting that this may change in the future if the circumstances change.