What are the exceptions of LDB.PROCESS? | SAP-ABAP

 Following are the exceptions of LDB_PROCESS:
=> LDB_ALREADY_RUNNING-- If logical database process a previous call, then it may not be called. Then the exception  LDB_ALREADY_RUNNING is executed.
=> LDB_NOT_REENTRANT-- This exception is triggered to prevent the logical database to be called repeatedly. A logical database may only be called repeatedly if its database program contains the subroutine LDB_PROCESS_INIT; otherwise, this exception is triggered.
=> LDB_SELECTIONS_NOT_ACCEPTED-- This exception is triggered for error handling in the subroutine LDB_PROCESS_CHECK_SELECTIONS of the database program in the logical database.