Cisco 857 Firewall error

[armadasols]

I have a new Cisco 857 router and cannot get the firewall configured. When I try to delivery the firewall config to the router (I'm using SDM delivered with the router) I get an error as follows

class-map type inspect imap match-any sdm-app-imap

Error detected at this command. Click OK

I have recently configured two 877 routers using SDM with no problem. Is there an issue with the 857??

[John Blakley]

What's under your class for sdm-app-imap?

[armadasols]

I think it is set to match invalid-command. But I am configuring the firewall entirely using SDM so it is creating these classes. I assume it is using whatever the default settings are. I have also done some digging and I believe there is a known bug in SDM that tries to implement features on some routers that they do not support. Is this correct and could this be the nub of the problem here?