How to set MRUNumber object

[Tim Ulrich]

I need to be able to set the value of MRUNumber in the OpenSave object in Preferences. When I enter this code,

(vl-load-com)
(setq objApplication (vlax-get-acad-object))
(setq objPreferences (vla-get-Preferences objApplication)) (setq objOpenSave (vla-get-OpenSave objPreferences)) (setq objMRUNumber (vla-get-MRUNumber objOpenSave)) (vla-put-MRUNumber objOpenSave 9)

I get this error message:

; error: no function definition: VLA-PUT-MRUNUMBER

Any clue what I'm doing wrong?

Thanks in advance.
Tim Ulrich
CAD Manager
HOK Houston