Delete rules for logical parent segment B

The delete rules for segment LP B control the deletion of LP B on its physical path. A delete call for a concatenated segment is interpreted as a delete of the logical child only.

The rules are as follows:

To ensure that LP B remains accessible until the last logical relationship path to that occurrence has been deleted, choose the physical delete rule. If an attempt to delete LP B is made while there are occurrences of real logical child (RLC) B pointing to LP B, a 'DX' status code is returned and no segment is deleted.
To allow segment LP B to be deleted on its physical path, choose the logical delete rule. When LP B is deleted, it is no longer accessible on its physical path. It is still possible to access LP B from PP A through RLC B as long as RLC B exists.
Use the virtual delete rule to physically delete LP B when it has been explicitly deleted by a delete call or implicitly deleted when all RLC Bs pointing to it have been physically deleted.