https://www.cisco.com/c/en/us/support/docs/wireless/ultra-packet-core/220999-review-sgw-incorrectly-handling-mbreq.html
Review SGW Incorrectly Handling MBReq & CBReq Collision - Cisco
This document describes the collision observed between Modify Bearer Request (MBReq) and Create Bearer Request (CBReq) in the SGW during N26 handover.
reviewsgwincorrectlyhandlingcollision