Changing Null to Zeros in existing measure

[irishtate]

I'm very new to BI and measure creation, so please bear with me. I have a measure I created to calculate the difference between two column amounts based on the column date.

In some of those colums there are (blank) spaces or null in place of 0's. How do I update my current measure to replace null with 0?

I've tried transforming the data first (to bypass needing to create a measure), but for some reason it still only shows up as blanks spaces in my data.

Please see below.

Difference =

IF (

HASONEVALUE ( 'AP_Transactions'[PerPost] ),

BLANK (),

CALCULATE (

SUM ( 'AP_Transactions'[TranAmt] ),

FILTER ( 'AP_Transactions', 'AP_Transactions'[PerPost] = MAX ( 'AP_Transactions'[PerPost] ) )

)

- CALCULATE (

SUM ( 'AP_Transactions'[TranAmt] ),

FILTER ( 'AP_Transactions', 'AP_Transactions'[PerPost] = MIN ( 'AP_Transactions'[PerPost] ) )

))

[Greg_Deckler]

@irishtate Perhaps:

Difference =
VAR __Diff = 
IF (
HASONEVALUE ( 'AP_Transactions'[PerPost] ),
BLANK (),
CALCULATE (
SUM ( 'AP_Transactions'[TranAmt] ),
FILTER ( 'AP_Transactions', 'AP_Transactions'[PerPost] = MAX ( 'AP_Transactions'[PerPost] ) )
)
- CALCULATE (
SUM ( 'AP_Transactions'[TranAmt] ),
FILTER ( 'AP_Transactions', 'AP_Transactions'[PerPost] = MIN ( 'AP_Transactions'[PerPost] ) )
))

RETURN
__Diff + 0