How to end a participant's line in PlantUML sequence diagram

Question

Is there a way to end a participant's line in a sequence diagram before the end of the diagram? For example if I want to display how database stored procedures call each other:

@startuml
participant SP0
SP0 -> SP0 : Do minor stuff
create participant SP2
SP0 -> SP2 : Exec SP2
SP2 -> SP2 : Insert into table Tbl
SP2 -> SP2 : Do other stuff
SP2 -> SP0
SP0 -> SP0 : Do minor stuff
@enduml

I would like to terminate SP2's line as soon as it returns processing to SP0. Furthermore, if I later call a complicated procedure SP3 from SP0, I would like to place it on the same level vertically as SP2.

I can remove the footer with hide footbox but the line still stays there. Also activate and destroy don't end the line.

Thanks!

Answer 1

This option is not available on the sequence help. I suppose you have to have SP3 on the right side. A trick to shorten with the diagram's width is to add line breaks \n on long messages or notes.