FM: In all FileMaker Versions ... maybe from v12 on.
I'm just using the Relookup Field Contents step - which I rarely use - and am very confused by it's behavior + dialog text.
The dialog options clearly indicate that, if a specific field is to be targeted, the field "Go to target field" must be specified
The wording of this option implies that a field MUST be on the layout for the step to work.
However, when on a layout which DOES NOT contain the targeted field the step still works and throws no "Field missing" error.
And when there is a field on the layout, the field is NOT brought into focus.
Problem? => Label is wrong!
The label should NOT be Go to target field, rather Specify target field - like the Replace Field Contents dialog:
This can be tested easily in the attached example file.
Note: This may well apply to other script steps, which have been disconnected from the layout-dependence, but not yet correspondingly tweaked - no more time to check.
EDIT: corrected title to be more terse