What is the problem with my function?

Anonymous I guess you are getting error because of null, there is no NULL in DAX functions but instead it is BLANK()

 

try this:

 

PROCESSED DAYS = IF('SURFACE INV DATA SOURCE'[SLA - PROCESSED]="Late",DATEDIFF('SURFACE INV DATA SOURCE'[SENT TO EZPAY],'SURFACE INV DATA SOURCE'[RECEIVED/DOWNLOADED],DAY))

 

You don't need to pass a value for else if will be treated as blank, but if you need another value, you can pass that in else part of the if condition.

 

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