I make it quick. Maybe Shopify support recognized then the huge amount of people who have this Problem.
So in the End we have 2 locations, each with his own inventory
They get charged with double amount of Shipping rate.
WE ONLY WANT CUSTOMER TO PAY ONE FLAT SHIPPING RATE FOR WHOLE CART - NO MATTER WHERE THE PRODUCTS ARE.
Please add a checkbox for this problem to handl different Locations as one
Its a mess that this thread is marked as solved:
What is wrong here with support? This problem occured Months ago!!