Loop is undoing changes to messages

I’m changing a message within a Loop using a message assignment, with a command as stated below:

xpath(message, “xpath comand string”)=intResultFromOtherXpath

after doing this my message has changed.

Now this is the strange part. Everytime the loop goes back to the top the message is back to its original state, as if the command I wrote above had never been executed.

Thanks in advance.

P.S.: I’ve got to have this working by tommorow at midnight…