exogenous variables and cointegration

[hetero]

My question has to do with the Johansen cointegration technique and with the associated error-correction model.
The question is how can I define a list of exogenous I(1) variables whose effects are assumed to be confined to the cointegrating relationships (restricted actually to the cointegrating space)?
The current selection (E-views 6.0) in the vector error correction model specification window defines only exogenous variables that are not included within the cointegrating relationships

Regards