I assume you want to convert a .mer into a .apa and if this is correct what version was it originally created in?
I believe V5.0 and later allowed for the conversion as long as the check box was left check.
There is a workaround if it was do prior to V5.0 but it doesn't convert everything..I think you loose the alarm and parameter files plus some other stuff I can't think of.
Hope this helps and welcome.