& not included in line &

What causes this issue?

In order to perform this function for item &V2&, the system needs an
entry in field "&V1&". However, the field does not contain a value or
is not relevant to the item.

System Response

The system cannot perform the function.

How to fix this error?

Press ENTER and choose another function.

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.