The return types for the following stored procedures could not be detected

Question

While drag-drop a stored procedure in dbml file I get this error:

Unknown Return Type
The return types for the following stored

Answer 1

I also had this problem - had to comment out code that was constructing a polygon:

declare
    @MapBounds geography
    ;

select
    @MapBounds = geography::STGeomFromText('POLYGON((' + 
        cast(@NorthEastLng as varchar) + ' ' + cast(@NorthEastLat as varchar) + ', ' +  
        cast(@SouthWestLng as varchar) + ' ' + cast(@NorthEastLat as varchar) + ', ' +  
        cast(@SouthWestLng as varchar) + ' ' + cast(@SouthWestLat as varchar) + ', ' +  
        cast(@NorthEastLng as varchar) + ' ' + cast(@SouthWestLat as varchar) + ', ' + 
        cast(@NorthEastLng as varchar) + ' ' + cast(@NorthEastLat as varchar) + 
        '))', 4326)
    ;

Once it was added to the dmbl, I un-commented out the code and it worked like a champ!