Combining measures

Here is one way that might work for you.

Credit Debit Ration =

var summarytable = SUMMARIZE (
        RP_TR_TRANSACTION_DETAILS,
        RP_TR_TRANSACTION_DETAILS[As of Date],
        RP_TR_TRANSACTION_DETAILS[account_cd],
        "TotalCount", Sum(RP_TR_TRANSACTION_DETAILS[Amount])
    )

var credit = SUMX (
    Filter(summarytable,[TotalCount] >0)
    [TotalCount]
)

var  = debit = SUMX (
    Filter(summarytable,[TotalCount] <0)
    [TotalCount]
)

return credit/debit

If this works for you, please mark it as the solution.  Kudos are appreciated too.  Please let me know if not.

Regards,

Pat