Help with a measure DAX

Hi, STEVE_WT , see if this helps you.

Apples Plus One Customers = 
CALCULATE(
    // 1. COUNT: Count the unique accounts that meet the filtering criteria.
    DISTINCTCOUNT('ALL DATA MART'[Master Account No]),
    
    // 2. FILTER CONTEXT: Iterate through every unique Master Account No.
    FILTER(
        VALUES('ALL DATA MART'[Master Account No]),
        
        // --- CHECK A: Must have purchased 'Apples' (Filter 1) ---
        CALCULATE(
            COUNTROWS('ALL DATA MART'),
            'ALL DATA MART'[Product Category] = "Apples"
        ) > 0
        
        // --- CHECK B: Must have purchased MORE THAN ONE category (Filter 2) ---
        && 
        CALCULATE(
            DISTINCTCOUNT('ALL DATA MART'[Product Category])
        ) > 1
    )
)