Import open purchase and sales Order in to AX 2009

I'm trying to import open purchase orders from Excel into AX 2009.  I am successfully imported in to purchtable but I tried to import in purchline as well. one purches order has 7 line items I imported in purchline, its showing massage 7 transaction successfully imported, but while I open purchase order its not showing any line items. I checked in data base in purchline table its showing only one record. Is there any issue in import data? Or what is procedure to import open purchase order and sales orders?

Thanks for kind support. 

Mohammed