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Private Sub Is Triggered From A Different Worksheet

This is an inherited workbook, not my code, but I want to understand why this is triggered by a change on the Score Card worksheet if it is a private sub on the Sheet4 worksheet.
The Undo stack is cleared by this sub, and I've read enough to accept that losing Undo happens with some events, but why on a different worksheet?

sub on Sheet4
Private Sub Worksheet_calculate()
    Dim cht As Chart

    Set cht = Worksheets("Sheet4").ChartObjects(1).Chart

    cht.Axes(xlValue).MinimumScale = Worksheets("Sheet4").Range("M3").Value
    cht.Axes(xlValue).MaximumScale = Worksheets("Sheet4").Range("N4").Value
    cht.Axes(xlValue).MajorUnit = Worksheets("Sheet4").Range("O4").Value

End Sub

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from the sub
Worksheets("Sheet4").Range("M3").Value
=M2-DAY(M2)+1

other cell formulas/values
Worksheets("Sheet4").Range("M2").Value
=IF(Calculations!B49=0,Sheet4!B3-90,Sheet4!B2)

Calculations!B49
=COUNTIF('Score Card'!$E$19:$E$30,Calculations!$A49)

'Score Card'!$E$19:$E$30
project phases entered manually

Calculations!$A49
"Design"
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Alan Varga
Asked:
Alan Varga
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1 Solution
 
Rgonzo1971Commented:
Hi,

Private Sub Worksheet_calculate() is an event code.
It is triggered every time excel calculates the sheet

Regards
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Roy CoxGroup Finance ManagerCommented:
Are you sure that is the correct module. It looks like it may have been hand typed because the c in Calculate is Lower Case

Private Sub Worksheet_calculate()

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The left hand drop down in the VB Editor should read WorkSheet, if it doesn't then it is not in the correct module.

2016-07-19_174137.png
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Alan VargaAccess DeveloperAuthor Commented:
The behavior hasn't changed after changing the punctuation.  I know this is the offending code, because I set a breakpoint and verified a halt after typing in a value on the Score Card worksheet.

This code is in the Sheet object, not a standalone module.  There is code for another sheet with a similar sub (except that references the ChartObjects name explicitly ("Chart 4"); the author apparently wanted to update some Gantt chart ranges in two different worksheets if any of the dates changed.
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Alan VargaAccess DeveloperAuthor Commented:
The behavior hasn't changed after changing the punctuation.  I know this is the offending code, because I set a breakpoint and verified a halt after typing in a value on the Score Card worksheet.

This code is in the Sheet object, not a standalone module.  There is code for another sheet with a similar sub (except that references the ChartObjects name explicitly ("Chart 4"); the author apparently wanted to update some Gantt chart ranges in two different worksheets if any of the dates changed.
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Roy CoxGroup Finance ManagerCommented:
Have you got two Calculate events in the same sheet module? That is not allowed and will error.
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Rgonzo1971Commented:
Does a change in the ScoreCard sheet has an effect on Sheet4 or not?
If yes that's the answer
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Alan VargaAccess DeveloperAuthor Commented:
Roy,
No, there's only one Calculate event in each of the two sheet modules I mentioned.
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Alan VargaAccess DeveloperAuthor Commented:
RGonzo,
Yes, a change to the correct cell on the ScoreCard sheet could trigger a change on the metrics on Sheet4.  I would think Excel would have a record of triggering cells in memory and only fire the macro if one of those cells was changed; if any other cell, the event would be ignored.
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Rgonzo1971Commented:
a change to the correct cell on the ScoreCard sheet could trigger a change on the metrics on Sheet4
it does not necessarily change the result but it's calculating it, therefore the event
like =IF('ScoreCard'!A1>10,"Bigger than 10","Not bigger than 10") if you change the value of 'ScoreCard'!A1 from 4 to 6, it does not change the result but it will recalculated
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Alan VargaAccess DeveloperAuthor Commented:
OK, I guess I can understand that logic.  Thanks for the explanation and verification.
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