Create a measure in query editor

[nh27]

I have a column in Table A that I need to return a value based on a calculation using a value from another column in table A and also a value in Table B. 

Table A & B are linked with a one to many relationship but can't seem to figure out how to reference this in the query editor, anyone have any ideas how to achieve this?

[johnt75]

Depends on which end of the relationship Table A is. If Table A is the many side then in a calculated column on Table A you can get a value from Table B using RELATED. If Table A is the one side then you would use RELATEDTABLE along with an iterator like MINX, MAXX.

[nh27]

I'm not able to use any of these formula it seems, although I have a one to many relationship established in the power query editor itself for a calculated column.

So for example, left table is my customer lookup, right table is my data table A.

I want the COGS column to be a calculation taking "Volume" from data table A * "Cogs Rate" from customer lookup.

The relationship is managed based on the Customer/Material unique key I have created.

Any ideas?

[johnt75]

That should just be

COGS =
'Table A'[Volume] * RELATED ( 'Customer'[Cogs rate] )

[nh27]

I just cannot seem to reference the Customer_Lookup table in this formula, only Table A, not sure why as the relationship is there in place.

[johnt75]

Is it giving an error? If there are squiggly red lines in the formula bar it could just be Intellisense playing up.

[nh27]

This is the error I am getting

[nh27]

I should also mention I am trying to create this custom column inside the data table itself

[johnt75]

That's in Power Query, its supposed to be in DAX. Select New Column from the modelling tab and put the formula in there.

[nh27]

I'm trying to achieve this in Power Query in the editor, is it not possible?

[johnt75]

I think it is but I don't remember the syntax for doing it in Power Query.

[nh27]

Thanks for your help thus far I appreciate it.

Does anyone have any ideas on how to achieve this?