What made you want to look up negative valence? Please tell us where you read or heard it (including the quote, if possible).
WBS is nothing but Work Breakdown Structure. It is mainly used in Project System (PS) module. Tcode: CJ20N. For any project defined we must have atleast one WBS. Within this WBS we can have networks. Networks are nothing but the series of activities. Material are used to perform the activities.
SMS is generally used to inventory devices and to make updates to operating system and applications. Complex WBT implementations frequently use SMS in combination with Microsoft Internet Explorer and line-of-business applications. SMS is especially helpful in this implementation for inventory and update management.