I was wondering if it's possible to change the mentioned dates.
Thanks a lot.
I am not sure if I understand your demand/question correct but refer may be to:
Chapter: Changing Work Areas with Versioning
Working with change numbers allows you to change header data or data on "lower" level of a work area.
Therefore I believe the answer to your question might be: yes. By using the "versioning" (as. shown in the above example) you create a "split" in data record. To my knowledge the dates:
01/01/0001 and 31/12/9999 are the "min/maximum" dates. By using the versioning the administration data shoud be effected. I did not try to use change numbers in this context.
If you check:
it is explained that the "valid from"/"valid to" are part of the administration data.
E.g. if you take a look here:
the header dates of a work area can be used as search criterias etc.