Don't forget APDivision.  If you don't use divisions, set it to 00.

Hi Kevin,  Thank you for your response. 
I tried as you suggested, but the error is still the same. 
I have following fields in my Data Tab:
Purchase Order No

Purchase Order Date

Order Type

Vendor No

APDivision No

Item Code

Quantity Ordered 

Is there any other field that's mandatory and I'm missing here?

The Division Number should go ahead of the Vendor Number in the VI job.

It worked! Thank you so much

I am also trying to import data into IM- Transaction Entry and I have following fields:

H. Transaction Type

H.Entry No

H.Transaction Date

H.Comment

H.DefaultFromWhseCode

H.BatchNo

L.ItemCode

L.warehouseCode

L.UnitCost

L.TransactionQty

LL.LotSerialNo

LL. TransactionQty

And the error i'm getting is: "T Record Invalid or Write Failed."

Is there anything I'm missing?