Min and max based in-between two tables

Saxon10  PFA

__countryCodeFromData = 
VAR __data =
//FILTER Data by Report based on Data[Item] = Report[Item]
//SELECT only Data[Couuntry Code] from the above join of two tables 
//and rather simply selecting the field create a copy of the same field to break the data lineage if any
// The result will be a single row table like {"ADMK", "DMK"}
    SELECTCOLUMNS (
        SUMMARIZE (
            FILTER ( Data, ( Data[Item] ) IN ( SUMMARIZE ( Report, Report[Item] ) ) ),
            Data[Country Code]
        ),
        "cc", [Country Code] & ""
    )
// count rows of the above table    
VAR __cnt =
    COUNTROWS ( __data )
// create a black list; these are the items need to be removed from the __data tbl    
VAR __intermediate =
    DATATABLE ( "cc", STRING, { { "ADMK" } } )
//left anti join self-explanatory    
VAR __anti =
    EXCEPT ( __data, __intermediate )
// if __cnt >1 {"ADMK", "DMK"}  then count the anti-join rows else count the filter table rows    
RETURN
    IF ( __cnt > 1, MAXX ( __anti, [cc] ), MAXX ( __data, [cc] ) )

__salesQTFromData = 
VAR __item =
    MAX ( Report[Item] )
VAR __cc = [__countryCodeFromData]
RETURN
    CALCULATE (
        MAX ( Data[Sale Qty] ),
        FILTER ( Data, Data[Item] = __item && Data[Country Code] = __cc )
    )