Export and import sales order with XML

Guys

I am finished export and import sales order with XML but i face a problem with import
this error appear


Microsoft Dynamics NAV

You cannot base a date calculation on an undefined date.

Date: 0D
Formula:


OK

Hi,It should be a line in C/AL code which tries to calculate a date (like CALCDATE) but the date field is empty. Did you already activate the debugger?Rene