Procurement Requisition dates

Hello everyone,
I am having a problem in One World XE Procurement. When entering a
requisition, the Requested Date (DRQJ) and the Promised Delivery Date (PDDJ)
must be greater than or equal to the system date.
I need to find a way to allow those fields to be populated with past dates.
JD Edwards will not assist me with this problem because they do not intend
for a user to be able to populate those fields with past dates.
I tried changing the "Date Invalid" error that comes up to a soft warning in
the data dictionary, but then an "Action Invalid" error occurs. I would
really appreciate any input into this matter.
Thanks a lot!