Start Level 1 Node: ABAP - Object ServicesABAP - Object ServicesEnd Level 1 Node: ABAP - Object Services
   Start Level 2 Node: The Persistence ServiceThe Persistence ServiceEnd Level 2 Node: The Persistence Service
      Start Level 3 Node: Concepts Used in PersistenceConcepts Used in PersistenceEnd Level 3 Node: Concepts Used in Persistence
      Start Level 3 Node: Components of the Persistence ServiceComponents of the Persistence ServiceEnd Level 3 Node: Components of the Persistence Service
      Start Level 3 Node: Management States of an ObjectManagement States of an ObjectEnd Level 3 Node: Management States of an Object
      Start Level 3 Node: MappingMappingEnd Level 3 Node: Mapping
         Start Level 4 Node: Mapping by Business KeyMapping by Business KeyEnd Level 4 Node: Mapping by Business Key
         Start Level 4 Node: Mapping by Instance-GUIDMapping by Instance-GUIDEnd Level 4 Node: Mapping by Instance-GUID
         Start Level 4 Node: Mapping by Instance-GUID and Business KeyMapping by Instance-GUID and Business KeyEnd Level 4 Node: Mapping by Instance-GUID and Business Key
      Start Level 3 Node: Inheritance in Persistent ClassesInheritance in Persistent ClassesEnd Level 3 Node: Inheritance in Persistent Classes
      Start Level 3 Node: Saving Object References PersistentlySaving Object References PersistentlyEnd Level 3 Node: Saving Object References Persistently
      Start Level 3 Node: Persistent Objects and COMMIT WORKPersistent Objects and COMMIT WORKEnd Level 3 Node: Persistent Objects and COMMIT WORK
      Start Level 3 Node: The Persistence Service During UpdatesThe Persistence Service During UpdatesEnd Level 3 Node: The Persistence Service During Updates
   Start Level 2 Node: Transaction ServiceTransaction ServiceEnd Level 2 Node: Transaction Service
      Start Level 3 Node: Transaction Service and SAP Transaction ConceptTransaction Service and SAP Transaction ConceptEnd Level 3 Node: Transaction Service and SAP Transaction Concept
      Start Level 3 Node: Components of the Transaction ServiceComponents of the Transaction ServiceEnd Level 3 Node: Components of the Transaction Service
      Start Level 3 Node: Transaction ModeTransaction ModeEnd Level 3 Node: Transaction Mode
      Start Level 3 Node: Nesting and ConcatenationNesting and ConcatenationEnd Level 3 Node: Nesting and Concatenation
      Start Level 3 Node: Interaction between Classical and Object-Oriented TransactionsInteraction between Classical and Object-Oriented TransactionsEnd Level 3 Node: Interaction between Classical and Object-Oriented Transactions
      Start Level 3 Node: Check AgentsCheck AgentsEnd Level 3 Node: Check Agents
   Start Level 2 Node: Query ServiceQuery ServiceEnd Level 2 Node: Query Service
      Start Level 3 Node: Concepts Used in QueriesConcepts Used in QueriesEnd Level 3 Node: Concepts Used in Queries
         Start Level 4 Node: Filter ConditionFilter ConditionEnd Level 4 Node: Filter Condition
         Start Level 4 Node: Sort ConditionSort ConditionEnd Level 4 Node: Sort Condition
      Start Level 3 Node: Query Service ComponentsQuery Service ComponentsEnd Level 3 Node: Query Service Components
   Start Level 2 Node: Dealing with ExceptionsDealing with ExceptionsEnd Level 2 Node: Dealing with Exceptions
   Start Level 2 Node: Working with Persistent Objects: ExamplesWorking with Persistent Objects: ExamplesEnd Level 2 Node: Working with Persistent Objects: Examples
      Start Level 3 Node: Generating a Persistent ObjectGenerating a Persistent ObjectEnd Level 3 Node: Generating a Persistent Object
      Start Level 3 Node: Object-Oriented Transaction ModeObject-Oriented Transaction ModeEnd Level 3 Node: Object-Oriented Transaction Mode
      Start Level 3 Node: Using a QueryUsing a QueryEnd Level 3 Node: Using a Query