Write the success measure in one sentence
If the objective cannot be stated as a measurable outcome with a date, the project has an activity list, not a goal. Force the sponsor to say what number moves and by when.
Do this: Draft: "Reduce order-to-cash cycle from 42 to 30 days by 31 March." Get the sponsor to sign it.
Avoid: Objectives like "improve efficiency" or "deliver the platform" — neither can be tested at closure.