You have button on form, not report.
You have to code in something - either macros or VBA. You appear to be using macros. I don't use macros.
Set the OutputFile argument to:
Code:
"C:\Purchase Orders\" & Forms![Purchase Order View by PO number_f]![PO Number] & ".pdf"
That should work but isn't for me. VBA does work:
Code:
Private Sub Save_PDF_Click()
DoCmd.OutputTo acOutputReport, "PO Report by PO number", acFormatPDF, "C:\Purchase Orders\" & Me.[PO Number] & ".pdf"
End Sub
Data structure is wrong. Should not have multiple tables for ChangeOrders, Contracts, Customers, Employees, Labor, Purchases, Sales, Vendors. Why do you do this?
Strongly advise not to use spaces nor punctuation/special characters (underscore only exception) in naming convention.