score:0
Accepted answer
In your table mapping, is the field marked as 'Auto Generated Value' in the Properties pane? I've had insert/update issues with that before... – Tieson T. Mar 7 at 6:52
I would give him the props for this, but he left this as a comment, and not an official answer.
score:2
I have seen something like this before.
It happens when you only assign the 'id' and not the related object.
Try the following:
new FileType
{
FileCategory = def.Category,
...
}
Source: stackoverflow.com
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