To find when stock amount of an item turns to positive from negative

[IEG]

Hi,

I have a stock projection file, it predicts the stock amount of items in each week considering open orders, usage etc. 

I need to find when stock amount of an item turns to positive from negative. In the below example we will have a supply gap of 147 pcs in week 29, however in the following week (week30) because of incoming products we will have an excess of 1604 items. So I need to create a measure which calculates week 30 

Thanks

[johnt75]

Create a couple of measures like

Negative to Positive =
var currentValue = [Volume]
var prevValue = CALCULATE([Volume], DATEADD('Date'[Date], -7, DAY))
return IF( prevValue < 0 && currentValue > 0, 1)

Week turns positive = FIRSTNONBLANK('Date'[Week no 2], [Negative to Positive])

[amitchandak · Accepted solution]

@IEG , One of the Idea I have is to create measure This week vs last week and check

if( [Last Week] >0 && then [This Week] <0 , 1, blank())

For this week vs last week

You need week rank in a separate date/week table

Week Rank = RANKX(all('Date'),'Date'[Week Start date],,ASC,Dense)
OR
Week Rank = RANKX(all('Date'),'Date'[Year Week],,ASC,Dense) //YYYYWW format

and then create measures like
This Week = CALCULATE(sum('Table'[Qty]), FILTER(ALL('Date'),'Date'[Week Rank]=max('Date'[Week Rank])))
Last Week = CALCULATE(sum('Table'[Qty]), FILTER(ALL('Date'),'Date'[Week Rank]=max('Date'[Week Rank])-1))

Power BI — Week on Week and WTD
https://medium.com/@amitchandak.1978/power-bi-wtd-questions-time-intelligence-4-5-98c30fab69d3
https://community.powerbi.com/t5/Community-Blog/Week-Is-Not-So-Weak-WTD-Last-WTD-and-This-Week-vs-La...
https://www.youtube.com/watch?v=pnAesWxYgJ8