Unit & does not correspond to dimension &

What causes this issue?

For dimension &V2&, you have selected unit of measure &V1& as an SI
unit. This is not permitted.

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?

Specify a valid SI unit. Refer to the online help (F4) for a list of
permitted bvalues.

Error message extract from SAP system. Copyright SAP SE.