After Sprint Planning, the Product Backlog Items selected into the Sprint backlog are frozen and cannot be modified. In that case, is the only way to modify it is to have the Product Owner cancel the Sprint?

After Sprint Planning, the Product Backlog Items selected into the Spr

1.	After Sprint Planning, the Product Backlog Items selected into the Sprint backlog are frozen and cannot be modified. In that case, is the only way to modify it is to have the Product Owner cancel the Sprint?
Answer» No. The Sprint Goal gives some FLEXIBILITY to the Development Team. If the work turns out to be DIFFERENT than expected, the Development Team collaborates with the Product Owner to negotiate the scope of the Sprint BACKLOG within the Sprint. In that case, the development team discusses with the PO and reaches the CONCLUSION.