Why isn't this nested loop working?

Question

I can't get this to loop through to the next row. The inner two loops are working fine from what i can tell using the debugger but it never goes to the next row. Any help would be appreciated.

Sub PopulateData()
Dim s1 As Worksheet
Dim s2 As Worksheet
Dim locationRow As Integer
Set s1 = ThisWorkbook.Sheets("Order_LVL")
Set s2 = ThisWorkbook.Sheets("sheet1")
Dim Lastrow As Integer
Lastrow = s1.Cells(Rows.Count, 1).End(xlUp).Row
Dim iRow As Integer

For iRow = 1 To Lastrow
Dim cellj As Range
    For Each cellj In s1.Range("B:F")
    locationRow = 1
    Dim celli As Range
        For Each celli In s2.Range("B1:F1")
        Dim currentrow As Long
        currentrow = iRow + 1
            If s1.Cells(currentrow, cellj.Column).Value = 0 Then

            ElseIf s1.Cells(currentrow, cellj.Column).Value <>   s2.Cells(locationRow, celli.Column).Value And s2.Cells(currentrow, celli.Column).Value = 0 Then
            s2.Cells(currentrow, celli.Column).Value = 0
            Else: s2.Cells(currentrow, celli.Column).Value = 1 'indicates that this order features a line from this location
            End If
        Next celli
    Next cellj
Next iRow
End Sub

Answer 1

Can you try this on some test data (Note I haven't tested it myself but re-written it with only two loops)

Sub PopulateData()
Dim s1 As Worksheet: Dim s2 As Worksheet
Dim rng As range: Dim rng2 As range
Dim cell: Dim header

With Application
    .ScreenUpdating = False
End With

With ThisWorkbook
    Set s1 = .Sheets("Order_LVL")
    Set s2 = .Sheets("sheet1")
End With

With s1
    Set rng = range(.Cells(1, 2), .Cells(.Cells(Rows.Count, 6).End(xlUp).Row, 6)) ' Used Range in Order_LVL
End With

Set rng2 = range(s2.Cells(1, 2), s2.Cells(1, 6)) 'Header range in sheet1

For Each cell In rng.Cells
    For Each header In rng2.Cells
        If cell.value = 0 Then

        ElseIf cell.value <> header.value And s2.Cells(cell.Row, header.Column).value = 0 Then
            s2.Cells(cell.Row, header.Column).value = 0 ' Not sure why you're doing this - if it is already 0 why set it back to 0. Left it in for continuity
        Else
            s2.Cells(cell.Row, header.Column).value = 1 ' indicates that this order features a line from this location
        End If
    Next header
Next cell

With Application
    .ScreenUpdating = True
End With
End Sub

It should do what you want if I've understood correctly.