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This simply means that they cannot use this method of enforcement until you have a job, as it requires your employer (which you don't have) to deduct money from your wages. Hence, it's pointless even hearing the application unless you have a job against which, if granted, it can take effect.
You do, of course, remain liable to pay in the meantime, and they judgment creditor could look for other methods by which to enforce the debt, such as sending in the bailiffs.
Is there anything else I can assist with about this question?