Custom rounded? 0.5 up or down?

Sometimes the rounding in ERPNext doesn’t match how my supplier does it. For example, my supplier rounds 0.5 up, while ERPNext rounds it down. Can I manually enter adjustments for this, or is there a setting in ERPNext to handle it?

@tomasenskede in system settings there is one rounding method options


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Thanks!

Attempting to set a rounding method from NULL results in this warning:

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What kind of unexpected behavior are we talking about here? Can it change existing data? Or is it just that subsequent returns on a pre-existing invoice may not match up?