IF combined with a CALCULATE function

[Pfandgiraffe]

Hey,

i want to combine a IF-question with a CALCULATE function.

First i want to compare two values. Depend on the result i want to use the one or the other formular with the calculate function. It will work well but in some cases the result isn't what i espected and i don't understand why.

Goal is to calculate the inventory development. If the target number is bigger than the sales order, use the target number. Otherwise use the summary of al sales orders to calculate the inventory.

Bestandsentwicklung (Absatzplan/VK Aufträge) = if (sum('SCM ProdForecastEntry'[Absatzplanung]) > sum('VK OffeneAuftraege'[Restmenge])

Here is the hole code:

Bestandsentwicklung (Absatzplan/VK Aufträge) = 
if (sum('SCM ProdForecastEntry'[Absatzplanung]) > sum('VK OffeneAuftraege'[Restmenge]), 

CALCULATE(sum('SCM Artikelbestand'[Menge])+sum('SCM FA-Zeile'[Restmenge])-sum('SCM ProdForecastEntry'[Absatzplanung]),
	FILTER(
		ALLSELECTED('Datumstabelle'[Date]),
		ISONORAFTER('Datumstabelle'[Date], MAX('Datumstabelle'[Date]), DESC)
	)), 

CALCULATE(sum('SCM Artikelbestand'[Menge])+sum('SCM FA-Zeile'[Restmenge])-sum('VK OffeneAuftraege'[Restmenge]),
	FILTER(
		ALLSELECTED('Datumstabelle'[Date]),
		ISONORAFTER('Datumstabelle'[Date], MAX('Datumstabelle'[Date]), DESC)
	))
)

As i told, result is fine in this example:

But for some other products it will look like this:

Result for october makes no sence...

The only different i can see is that sum('SCM ProdForecastEntry'[Absatzplanung]) is the same like sum('VK OffeneAuftraege'[Restmenge]). (both values are 65)

Hope somebody have an idea whats going wrong in my syntax.

If i use the CALCULATE Syntax for his own (without the if-comparison) everything works great.

Thanks in advance!

[lbendlin · Accepted solution]

refactor your measure to isolate the individual computations.  

Bestandsentwicklung (Absatzplan/VK Aufträge) = 
var f = FILTER(
		ALLSELECTED('Datumstabelle'[Date]),
		ISONORAFTER('Datumstabelle'[Date], MAX('Datumstabelle'[Date]), DESC)
	)
var a = CALCULATE(sum('SCM Artikelbestand'[Menge])+sum('SCM FA-Zeile'[Restmenge])-sum('SCM ProdForecastEntry'[Absatzplanung]),f)
var b = CALCULATE(sum('SCM Artikelbestand'[Menge])+sum('SCM FA-Zeile'[Restmenge])-sum('VK OffeneAuftraege'[Restmenge]),f)
return if (sum('SCM ProdForecastEntry'[Absatzplanung]) > sum('VK OffeneAuftraege'[Restmenge]),a,b) 

That way it is easier to troubleshoot. 

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