Datediff with Many to Many Relationship

[HabibAdil]

Hi All, 

I am struggling to get the number of calender days between two dates using the datediff function with aggregation. I have done similar thing in the past but the tables had one to many relationship (https://community.powerbi.com/t5/Desktop/Enquiry-Response-Time-using-Datediff-where-the-Dates-are-in...). Attached is some sample data.

I am trying to calculate how late or early a SO line was delivered. If a SO line was delivered in two different batches i.e. not delivered in full, then we are using the latest date for calculation  as can be seen for SO A and Line 1.

Thanks for your help!!!

[Greg_Deckler]

You can't create a composite key using [So No] & [So Line No] ?

[HabibAdil]

Hi @Greg_Deckler Thanks for your quick response. I tried that, but SO No is a string and SO Line is a whole number. I get an error. The SO NO is not always a number, but could have characters, hence I cannot change it to a number.

[Greg_Deckler]

I'm not sure what the issue is @HabibAdil I have attached an example file where I concatenate a text column and a numeric column.

[HabibAdil]

Thank you @Greg_Deckler