Creating a flag using a value and two date fields

[Ben_jamin]

Hi Power Bi community,

I am hoping to gather some help in creating a flag to identify multiple service orders for a serial number based on contract start and end dates. I find it difficult to phrase this question....I belive the below visual shows this better then I can explain. 

The first two rows show 2 service orders for the same serial # with the same contract start and end date. The bottom two rows show 2 service orders for the same serial # but from different contract start and end dates. I am hoping to have the column "Miltiple Service Orders in a Contract" using DAX.

Service order #	Serial #	Contract Start Dt	Contract End Dt	Miltiple Service Orders in a Contract
123	ABC	1/1/2023	12/31/2023	yes
456	ABC	1/1/2023	12/31/2023	yes
789	DEF	3/31/2023	3/31/2024	no
789	DEF	4/1/2024	4/1/2025	no

[johnt75 · Accepted solution]

You can create a calculated column like

Multiple service orders in a contract =
VAR NumOrders =
    CALCULATE (
        COUNTROWS ( 'Table' ),
        ALLEXCEPT (
            'Table',
            'Table'[Serial #],
            'Table'[Contract start date],
            'Table'[Contract end date]
        )
    )
VAR Result =
    IF ( NumOrders > 1, "Yes", "No" )
RETURN
    Result