Error cannot convert value of type text to type true false

HI answeriver ,

• First thing is try to use DIVIDE dax function to do your calculation.
• Break-down your measure to variables
• I think the sytax error is on your ALLEXCEPT function. You have closed the bracket for this function too early.

Your syntax error is somehwere in this part of DAX:

ALLEXCEPT(
                   REPORT_IMS, 'REPORT_IMS'[CITY], REPORT_IMS[REGION (groups)], REPORT_IMS[VISIT MONTH]
                 ), // you have closed the ALLEXCEPT clause here

REPORT_IMS[VISIT YEAR],'Attributes','Attributes'[type contract] // this is the line with error I guess

Question for you: What you are trying to achieve here with the line of code above?

You will have to correct your DAX something like this:

= CALCULATE(
            DISTINCTCOUNT(REPORT_IMS[SALEPOINT CODE])
           )
/
CALCULATE(
          DISTINCTCOUNT(REPORT_IMS[SALEPOINT CODE]), 
          ALLEXCEPT( 
                    REPORT_IMS, 'REPORT_IMS'[CITY], REPORT_IMS[REGION (groups)], 
                    REPORT_IMS[VISIT MONTH], REPORT_IMS[VISIT YEAR]
                   ), 
         ALLEXCEPT(
                   'Attributes','Attributes'[type contract]
                  )
        )

Check if the above DAX works. Make sure to write your DAX as clean as possible - specially the closing and opening brackets.