[Resolved] Manual test execution works, automation does not.

Could this be a specific problem with assertions where the failing test step contains a parameterised value. For instance, ${GET - With Device ID#Id}, which would resolve to the device ID that I am interested in. I have got another test which is failing that does not follow this pattern so this is something of a stab in the dark. I don't think for a minute that this is insurmountable but I currently don't know how to resolve this.