The quantities in combination & & will be ignored

What causes this issue?

Combination &v1& &v2& has already been planned or posted to. No
quantities were entered. When transferring the data, a quantity unit and
usage quantities were entered for the combination in question. However,
these are not taken into account because of the missing quantity unit in
the cost element control segment.

System Response

The usage fields are initialized.

How to fix this error?

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

Error message extract from SAP system. Copyright SAP SE.