Each time I import Purchase order I get error ,,,,,,,,,,,,,,,,

I'm trying to import Purchase order in AX 2012 using the data import export framework.

when I try to Get staging data I received this error:

'1' 'Purchase order header' record(s) inserted in staging
The file for entity Purchase order line is having 1 error(s)
'0' 'Purchase order line' record(s) inserted in staging

and the viewed error file:

PurchId,LineNumber,ItemId,Name,PurchQty,PurchPrice,LineAmount,InventSiteId,InventLocationId,PurchaseType,TaxItemGroup,TaxGroup,CurrencyCode,PurchUnit,VendAccount,VendGroup,ShippingDateConfirmed
,,,,,,,,,,,,,,,,

any help?