Help with New Window function

Hi Ackbar-Learner 

To replicate the behaviour of your original measure using the WINDOW function, a measure like this should work:

Board02aP&LRunningTotal =
CALCULATE (
    [Board01P&LAllTransactionAmountwithSign],
    WINDOW (
        0, ABS,
        0, REL,
        ALL ( TabPLGLItem[GLItem], TabPLGLItem[Index] ),
        ORDERBY ( TabPLGLItem[Index] )
    )
)

Does this work as intended?

Explanation:

• In order to order by TabPLGLItem[Index] for the running total, you must include TabPLGLItem[Index] in the Relation argument of WINDOW, and provide TabPLGLItem[Index] as the argument of ORDERBY.
• Your original measure used ALL to ignore existing filters (explicitly for TabPLGLItem[GLItem] and implicitly for TabPLGLItem[Index]), so ALL should be used when specifying the Relation argument as well.

Regards,

Owen