AMOS - Ta-equivalent - constrain parameters to be equal and to unity

Hi everyone,

I am trying to create a tau-equivalent measurement model in AMOS. Thus, I need to set each regression weight to 1 and give them the same parameter name so that they will be equal to one another. The AMOS user guide told me to label each parameter with a name, followed by a colon and a number. I tried this by setting each regression weight to "w:1", but the model won't run. Can somebody help? See attached for the model.