Datamismatch when doing a VBA Event in Access

I want to pass a variable when I double click on a form to open another form.  

 Line item number is a auto number with long integer on one table.

On the second table it is number with long integer.

When I created the double click event when I am on line item number

Private Sub line_item_number_DblClick(Cancel As Integer)
DoCmd.OpenForm "TBLservicelinedetails", WhereCondition:=" [line item number] = '" & Me.[line item number] & "'"
End Sub

Run time error 3464
Data type Mismatch in criteria expression....