Impossible to override the node add/edit page with myWorkbench and PageManager

I try to override the node add/edit page on my site, but when I try to enable the node add/edit page in Page Manager, it says me it is impossible because of myWorkbench :

"Page manager module is unable to enable node/%node/edit because some other module already has overridden with workbench_moderation_node_edit_page_override."

It it possible to override the node add/edit page another way ?

PS : I want to override node add/edit page for some content type where I use myWorkbench moderation and for some content type no using workbench moderation