Articulation marks in a dynamic staff

[Peter Toye]

I'm trying to engrave some piano music where the composer (or probably the original 19th century engraver) has saved time by putting accents midway between the staves (see attached snip). I've tried to do this in a dynamic staff with LP code like

s4->

but this gives warning messages, although the output looks OK.

Is there a better way of doing this?
 
Regards,

Peter
mailto:address@hidden
www.ptoye.com

Accent.png
Description: PNG image