Hi

Please do not quote the entire message

OK. Put this code in ThisWorkbook module (right click on ThisWorkbook)

Code:
Private Sub Workbook_BeforeClose(Cancel As Boolean)
    
    Dim r       As Range
    
    Const MySheet = "Sheet1"          '<<<<< adjust to suit
    Const MyRange = "A2:B32"          '<<<<< adjust to suit
    
    Set r = Worksheets(MySheet).Range(MyRange)
    
    If Application.WorksheetFunction.Count(r.Columns(2)) < _
        Application.WorksheetFunction.CountA(r.Columns(1)) Then
        MsgBox "Qty missing!", vbInformation
        On Error Resume Next
        Application.Goto r.Columns(2).SpecialCells(4)
        On Error GoTo 0
        Cancel = True
    End If
    
End Sub
Note: adjust the sheet name and the range accordingly.