Hello,
I am using a Vlookup and a sumif function in loops... when I gor through the
sub via F8 the calculation is correct but when I execute at once with F5 I
get a incorrect answer... I have to find a solution to this.
Here is a sample of it:
(I tried everything I know please aby help would be appreciated greatly)

For i = 4 To 500
If Sheets("DLF").Range("A" & i) = "" Then
Exit For
Else
TMC_BEG_INV_QTY = Sheets("DLF").Cells(i, 3).Value
TMC_BEG_INV_AMT = Sheets("DLF").Cells(i, 4).Value
TMC_PURCHASE_QTY = Sheets("DLF").Cells(i, 5).Value
TMC_PURCHASE_AMT = Sheets("DLF").Cells(i, 6).Value
TMC_USAGE_QTY = Sheets("DLF").Cells(i, 8).Value
If (TMC_BEG_INV_QTY + TMC_PURCHASE_QTY) = 0 Then
TMC_USAGE_AMT = 0
TMC_USAGE_MAC = 0
Sheets("DLF").Cells(i, 9) = TMC_USAGE_AMT
Sheets("DLF").Cells(i, 7) = TMC_USAGE_MAC
Else
TMC_USAGE_AMT = (TMC_BEG_INV_AMT + TMC_PURCHASE_AMT) /
(TMC_BEG_INV_QTY + TMC_PURCHASE_QTY) * TMC_USAGE_QTY
Sheets("DLF").Cells(i, 9) = TMC_USAGE_AMT
TMC_USAGE_MAC = (TMC_BEG_INV_AMT + TMC_PURCHASE_AMT) /
(TMC_BEG_INV_QTY + TMC_PURCHASE_QTY)
Sheets("DLF").Cells(i, 7) = TMC_USAGE_MAC
End If
End If
Next
TMC_BEG_INV_QTY = 0
TMC_BEG_INV_AMT = 0
TMC_PURCHASE_QTY = 0
TMC_PURCHASE_AMT = 0
TMC_USAGE_QTY = 0
TMC_USAGE_AMT = 0
TMC_USAGE_MAC = 0
Call DLF_USAGE_AMT_FEBCY
End Sub

Sub DLF_USAGE_AMT_FEBCY()
'FebCY
For i = 4 To 500
If Sheets("DLF").Range("A" & i) = "" Then
Exit For
Else
TMC_BEG_INV_QTY = Sheets("DLF").Cells(i, 12).Value
TMC_BEG_INV_AMT = Sheets("DLF").Cells(i, 13).Value
TMC_PURCHASE_QTY = Sheets("DLF").Cells(i, 14).Value
TMC_PURCHASE_AMT = Sheets("DLF").Cells(i, 15).Value
TMC_USAGE_QTY = Sheets("DLF").Cells(i, 17).Value
If (TMC_BEG_INV_QTY + TMC_PURCHASE_QTY) = 0 Then
TMC_USAGE_AMT = 0
TMC_USAGE_MAC = 0
Sheets("DLF").Cells(i, 18) = TMC_USAGE_AMT
Sheets("DLF").Cells(i, 16) = TMC_USAGE_MAC
Else
TMC_USAGE_AMT = (TMC_BEG_INV_AMT + TMC_PURCHASE_AMT) /
(TMC_BEG_INV_QTY + TMC_PURCHASE_QTY) * TMC_USAGE_QTY
Sheets("DLF").Cells(i, 18) = TMC_USAGE_AMT
TMC_USAGE_MAC = (TMC_BEG_INV_AMT + TMC_PURCHASE_AMT) /
(TMC_BEG_INV_QTY + TMC_PURCHASE_QTY)
Sheets("DLF").Cells(i, 16) = TMC_USAGE_MAC
End If
End If
Next
TMC_BEG_INV_QTY = 0
TMC_BEG_INV_AMT = 0
TMC_PURCHASE_QTY = 0
TMC_PURCHASE_AMT = 0
TMC_USAGE_QTY = 0
TMC_USAGE_AMT = 0
TMC_USAGE_MAC = 0
Call DLF_USAGE_AMT_MARCY
End Sub