OR Operator affecting my IF Statement

Yes. If you have A || B, then the expected result is true/false.

Did you mean to write your measure like this:

Validation to Closure =
IF (
    ISBLANK ( 'Cases'[applicationvalidationdate] ) || ISBLANK ( 'Cases'[Resolution Date] ),
    BLANK (),
    DATEDIFF ( 'Cases'[applicationvalidationdate], 'Cases'[Resolution Date], DAY ) + 1
)

Hi,

The OR statement shouldn'e be an issue, might be the way it's worded with 2 If statements instead of just 1 with an OR.  Try this:

Validation to Closure = if('Cases'[applicationvalidationdate] = BLANK()||'Cases'[Resolution Date]= blank(), BLANK(), DATEDIFF('Cases'[applicationvalidationdate],'Cases'[Resolution Date],DAY)+1)

 

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This is perfect - many thanks!