Context object problem

hi,

i have created a context object of type xsd:string and have assigned to a Message interface and have activated the change list.

In Integration directory when i am configuring the receiver determination i wanted to specify a condition.

i cannot see the context object in my condition editor. my sender is a business system with an SLD entry.

but if i use my sender as a business service i can see the context object.

my question is why cannot i see the context object when the sender is a business system.

appreciate ur response

thanks