Hi Corinne,Since DateTime is a value type you cannot assign null to it,
but exactly for these cases (absence of a value), You can set a DateTime
variable to MinTime but the variable itself cannot be null. To get this
MinTime use: ToDateTime() as expression with empty params. which will
set your date to 02-01-1900 00:00:00Regards,Amit
Hi Jean-SergeThanks for your inputs, they helped me solved my
problème.My 2 mistakes were the following:- updating a value with the ''
string (empty string) does not work (the value is not erased)- when
using the NULL value, you canot just enter NULL in the list of field to
be updated. You need to click on "Edit the source expression", then
enter NULL and validate.