Help getting latest date for earlier value

[Anonymous]

I have a table containing Dates when Responsibility gets set, see below.

This Responsibility Set Date produces very close to what I'm trying to achieve: I want to capture the CreateDate any time the Responsibility changes:

But in cases where there are multiple records per responsibility, the _current (MIN) variable reverts back to the initial CreateDate. So, I get why it's producing the results it is, but am not sure how to get it to produce the desired results.

For the rows with red x's (Index rows 8 and 10), I need to see:

Index row 8 = 12/14/2022 3:39:28 PM (capturing the CreateDate of row 7 at Responsibility change)

Index row 10 = 12/20/2022 3:53:28 PM (capturing the CreateDate of row 9 at Responsibility change)

Here's the dax currently generating the Responsibility Set Date results. I'm sure this is a simple fix, but it's been vexing for hours. Any help would be appreciated!

Responsibility Set Date = 
VAR previous =
CALCULATE(
    DISTINCT(LOA_Logs[Responsibility]),
    LOA_Logs[Index per LOA] = (EARLIER(LOA_Logs[Index per LOA]) - 1),
    ALLEXCEPT(LOA_Logs, LOA_Logs[LOA_UID], LOA_Logs[Responsibility])
)
VAR _current =
CALCULATE(MIN(LOA_Logs[CreateDate]),
FILTER(LOA_Logs,
LOA_Logs[LOA_UID] = EARLIER(LOA_Logs[LOA_UID]) &&
LOA_Logs[Responsibility] = EARLIER(LOA_Logs[Responsibility]))
)

RETURN
IF(LOA_Logs[Responsibility] <> previous, LOA_Logs[CreateDate], _current)

[tamerj1 · Accepted solution]

Hi @Anonymous 
First create a calculated column as follows

Index2 =
LOA_Logs[Index per LOA]
    - RANKX (
        CALCULATETABLE (
            LOA_Logs,
            ALLEXCEPT ( LOA_Logs, LOA_Logs[LOA_UID], LOA_Logs[Responsibility] )
        ),
        LOA_Logs[Index per LOA],
        ,
        ASC,
        DENSE
    )

The the following can be either a measure or a calculated column

Responsibility Set Date =
MINX (
    CALCULATETABLE (
        LOA_Logs,
        ALLEXCEPT ( LOA_Logs, LOA_Logs[LOA_UID], LOA_Logs[Index2] )
    ),
    LOA_Logs[CreateDate]
)

[Anonymous]

That did it @tamerj1  - thanks so much for the assist!

[amitchandak]

@Anonymous , Use Max in place of Min

Responsibility Set Date =
VAR previous =
CALCULATE(
DISTINCT(LOA_Logs[Responsibility]),
filter(LOA_Logs, LOA_Logs[Index per LOA] = (EARLIER(LOA_Logs[Index per LOA]) - 1) &&
LOA_Logs[LOA_UID] = earlier(LOA_Logs[LOA_UID]) && LOA_Logs[Responsibility] = earlier(LOA_Logs[Responsibility]) )
)
VAR _current =
CALCULATE(MAX(LOA_Logs[CreateDate]),
FILTER(LOA_Logs,
LOA_Logs[LOA_UID] = EARLIER(LOA_Logs[LOA_UID]) &&
LOA_Logs[Responsibility] = EARLIER(LOA_Logs[Responsibility]))
)

RETURN
IF(LOA_Logs[Responsibility] <> previous, LOA_Logs[CreateDate], _current)

[Anonymous]

Thanks for the assist @amitchandak, though unfortunately, this doesn't work. When I change MIN to MAX, I get a changing "Responsibility Set Date" even when the Responsibility field isn't changing. See below. In this screenshot, I'd expect rows 8-14 to all have Responsibility Set Date = 1/10/2023 3:59:38 PM.

Open to other suggestions - thanks again!