Populate calendar table fields between dates

This is my example pbix file.

I have got Calendar table (first one below, only first 3 rows as example) created in DAX.

Calendar = 
ADDCOLUMNS(
    CALENDARAUTO(),
    "Year", YEAR ( [Date] ),
    "Month", FORMAT ( [Date], "mmmm" ),
    "Month Number", MONTH( [Date] )
)

and Maturity table (second one). They are related by Date/SampleDate (1-*).

I use a measure AAA to populate dates when there were some test results with associated Code. To this point it's ok.

AAA = IF(SELECTEDVALUE('Calendar'[Date]) = SELECTEDVALUE('Maturity'[SampleDate]), SELECTEDVALUE('Maturity'[Code]),"")

Goal

I have a table below, values are AAA measure as above. How to fill the days when there were no results in a way that it uses the Code from the previous test, until a new test is done? The ideal results shown in the picture below in red.

Attempts

1. I can't use MAX to select the last date with a Code because it would populate only the very last one everywhere (eg. B to 15/4 - 18/4 for the second row = section B) after 19/4 with a new Code result.
2. I try to fill the gaps between the test dates with the last Code for each unique combination of Grower, Orchard, and ManagementArea (formula below). Unfortunately, the table is with no values in this case. I can't figure out where I'm making mistakes.

AAA = 
VAR SelectedDate = SELECTEDVALUE('Calendar'[Date])
VAR SampleCode =
    CALCULATE(
        SELECTEDVALUE('Maturity'[Code]),
        ALLEXCEPT('Maturity', 'Maturity'[SampleDate], 'Maturity'[Grower], 'Maturity'[Orchard], 'Maturity'[ManagementArea]),
        'Maturity'[SampleDate] <= SelectedDate,
        'Maturity'[Code] <> BLANK()
    )
VAR PreviousSample =
    CALCULATE(
        SELECTEDVALUE('Maturity'[SampleDate]),
        ALLEXCEPT('Maturity', 'Maturity'[Grower], 'Maturity'[Orchard], 'Maturity'[ManagementArea]),
        'Maturity'[SampleDate] < SelectedDate,
        'Maturity'[Code] <> BLANK()
    )
VAR NextSample =
    CALCULATE(
        SELECTEDVALUE('Maturity'[SampleDate]),
        ALLEXCEPT('Maturity', 'Maturity'[Grower], 'Maturity'[Orchard], 'Maturity'[ManagementArea]),
        'Maturity'[SampleDate] > SelectedDate,
        'Maturity'[Code] <> BLANK()
    )
RETURN
    IF(
        SampleCode <> BLANK(),
        SampleCode,
        IF(
            SelectedDate > PreviousSample && SelectedDate < NextSample,
            CALCULATE(
                SELECTEDVALUE('Maturity'[Code]),
                ALLEXCEPT('Maturity', 'Maturity'[SampleDate], 'Maturity'[Grower], 'Maturity'[Orchard], 'Maturity'[ManagementArea]),
                'Maturity'[SampleDate] = PreviousSample,
                'Maturity'[Code] <> BLANK()
            ),
            BLANK()
        )
    )