Cannot Convert value of type text to type True/False

Hi Anonymous 

I think it may be the position of your NOT function which is causing the problem.
Try this instead (not tested):

Volume =
CALCULATE(
    DISTINCTCOUNT( 'Orders'[Volume_Cal] ),
    FILTER(
        'Orders',
        'Orders'[PROCESS] IN { "Posted", "Credit", "Open Items" }
            && (
                'Orders'[DOCUMENTTYPE] = "AB"
                    || (
                        NOT ( TRIM( 'Orders'[DOCUMENTSTATUS] ) IN { "Ready Validation", "Not MVI" } )
                            || ISBLANK( TRIM( 'Orders'[DOCUMENTSTATUS] ) )
                    )
                        && 'Orders'[Open Status] = "In Process"
            )
    )
)

Best regards,
Martyn

If I answered your question, please help others by accepting it as a solution.

I doubt the position of not, check and  try

Volume = CALCULATE(DISTINCTCOUNT('Orders'[Volume_Cal])
,FILTER('Orders',
		'Orders'[PROCESS] in {"Posted","Credit", "Open Items"} 
			&& ('Orders'[DOCUMENTTYPE] = "AB" 
			|| (NOT(TRIM(('Orders'[DOCUMENTSTATUS])) in {"Ready Validation", "Not MVI"} )
			|| ISBLANK(TRIM('Orders'[DOCUMENTSTATUS]))) 
			&& 'Orders'[Open Status] ="In Process")))

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