Measure for Sum from 2 tables with added text column

[BobKoenen]

Hi All,

I have Dim table [customer] and 2 fact tables which I cannot append or merge. 

Customer	id
Joe	A
Jane	B
Joseph	C

Fact table 1

Id	Amount
A	500
B	400
C	100

Fact table 2

Id	Amount
B	1000

Now I want the measure to Sum the amount of [fact table 2] and (the amount of [fact table 1] Exept for the id`s that are present in the [fact table 2]). So Each id gets only included once. I also want a text for each row indicatin from which fact table the amount is taken. 

Result:

Customer	Amount	Origin
Joe	50	Fact table 1
Jane	1000	Fact table 2
Joseph	100	Fact table 1

Hope you can help me

[AlB · Accepted solution]

Hi @BobKoenen

I think it would be best to do this in PQ but see the file attached for a possible solution through measures as requested

Amount_M = 
VAR fT2_ = SELECTEDVALUE(FTable2[Amount])
RETURN
IF(ISBLANK(fT2_), SELECTEDVALUE(FTable1[Amount]), fT2_)  

Origin_M = 
VAR fT2_ = SELECTEDVALUE(FTable2[Amount])
RETURN
IF(ISBLANK(fT2_), "FTable1", "FTable2")  

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