Activation problem

Hi all,

I have strange problem: when I try to activate change list, I'm getting error:

Activation of the change list canceled Check result for Message Interface File_OB | http://pliva.com/Italy/WH1: Object Message Interface File_OB | http://pliva.com/Italy/WH1 references the inactive object Message Type FileInput_DT | http://pliva.com/Italy/WH1

But message type FileInput_DT is activated. I also tried to activate it again (with some small change) but same is happening.

Any help?

BR,

Ivan