We got complaints of this already from another user, so we'll probably implement something in the bridge for connecting order text and magic to a certain order.

Until then, you can solve this by implementing a simple handshake. Edit the Zorro EA and add a new brokerCommand that just sets and reads a global variable. Before setting the order parameters, read that variable and wait until it is zero. Then set it to nonzero, set your parameters, call the buy command, and set it back to zero.