DTW with journal entry: problem with duedate

We are uploading via DTW jornal entries. We cannot upload the journal entries having duedate in the past: for example 10.10.2008.

We are uploading the journal entry with posting date = 01.01.2009. We have already modified the posting period setting for january 2009: actually we had enlarged the duedate period and the document date period in order to have the range from 01012002 to 311209.

In the journal entry DTW template we are filling the field duedate (both in the header and in the rows) with the duedate date of our accounting entries.

Do you have any idea ?

Thank you all