ER-X-SFP - setting the SFP port speed

I would like to use the SFP port on the ER-X-SFP to connect to an Edge Switch 24 Lite.  

The problem seems to be that I need to set or force the port speed explicitly to 1000mbps on both sides.  This is easily done on the the switch but the ER-X-SFP doesn't allow this through the GUI (10 and 100 no problem but only AutoNegotiate for 1000mbps).

Can the SFP port speed be set explicity to 1000mbps using the CLI?

If so, would someone be kind enough to post the command lines needed to do this.

Thank You