Billing unit of measurement could not be determined

Aug.2012: syntax of V1 .. V4 corrected, but text as such unchanged.

What causes this issue?

No billing unit of measurement could be determined from the rate
constellation valid on &V3& for device &V1&, register &V2&
.
.
The error occurred in program &V4&.

System Response

Processing is canceled.

How to fix this error?

Check your rate determination (specifically the billing unit of
measurement) for the register.
If you are unable to determine any errors, contact SAP.

Error message extract from SAP system. Copyright SAP SE.