Importing your data

This is the first year that I need to deal with T5008.. I imported all the T5008 from CRA , as before , no disposition dates or investment type imported .  I entered those info one by one in T5008.  I double check dates are entered line by line in T5008 .  When I use the NETFILE , the ERROR of missing disposition dates stop me to file it . What would be the reasons?