How to reference SIM files on 3DX with *EXTERNALFIELD

Hi 3DX Experts,

I have a job that needs mapping of a field from another job, using *EXTERNALFIELD. I have an example running locally with reference to the SIM file of the first job. 

 

In trying to transfer this to 3DX, I cannot get my head around how to reference the SIM file, anyone with experience on this?

 

Thanks