NOTE - Adjustments are always created as Self-Bill invoices; even if the worker/provider uses advice notesIf the Worker/Provider is set to self bill the adjustment will be as such, if not then an advice note will be raised and you will need to match this to a supplier invoice.
In some situations you may wish to raise an ad-hoc invoice adjustment but you do not wish to change an existing timesheet. An example of this might be that you pay a provider a fee at the end of a quarter.
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