Can't check "Check existing data on creation" in relationship

Hi
When I added relationship to table, checked "Check existing data on
creation" and clicked "Save" in Enterprise Management tool, it has no error.
However, when I check tables again, the "Check existing data on creation"
option was unchecked.
Help me!It's the expected behaviour: the first time you create the
relationship, the existing data is verified (if "Check existing data on
creation" is checked) and subsequently all the new data is verified (if
"Enforce relationship for INSERTs and UPDATEs" is checked).
If you modify something in the relationship (for example: the
relationship's name or the cascade updates/deletes checkboxes), the
existing data does not need be verified again (that's why this checkbox
is unchecked when you look at it later).
Only if you modify the relationship in more semnificative ways (for
example: different columns), you should make sure that you click on
"Check existing data on creation" so the existing data will be verified
according to the new relationship.
Razvan