I need a formula to use that will pull info from one tab to another

Hello,

I created a spreadsheet based on customer data that includes PO #'s, this data is updated daily. I would like to merge the information I export into my internal spreadheet.  I would like to use the PO # as the identifier so that columns D and E will populate. 

I have tried using the VLOOKUP function (=VLOOKUP(Sheet1!A2,Sheet1!A1:E42,4,FALSE) to merge the information, but it is bringing back the wrong value.

I would like to use the data in colunm A to populate the data in columns D and E.  Is there a formula I can use to ref the PO# in column A to populate C and D (C and D are the division and customer name).

I hope this is clear. Thank you for any insight.