The prices for the new price unit cannot be determined

What causes this issue?

The prices calculated by the system on the basis of the new
<GL:price_unit>price unit</> contain more digits than will fit in the
price fields.

System Response

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

How to fix this error?

Error message extract from SAP system. Copyright SAP SE.