On a map, you can set the value of a destination node to a fixed value, from within the mapper, simply by setting the value property when clicking the destination node on the right hand side schema. I’ve see people use the string functiods to pre-set a value, however you do not need to do this.
There is a catch I found in BizTalk 2009. If you set the fixed value on a map page other than the first page, it does not set, worse yet, if that field on the destination schema happens to be a promoted property, it does not promote the value, and will fail when you try and use the value inside your orchestration as desired.
You will not know why, the shape will just fail, with some weird exception.
Always use the first page.
