Subexpression &2 used with expression &1 is buffered

What causes this issue?

Expression &v1& is <DS><DS:DE.BRF_XNO_BUFFERING>not buffered</>
</> but the subexpression used is buffered.

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?

Check whether the subexpression used &V2& also needs to be calculated
anew for the new calculation of expression &v1&. With subexpression &v2&
, you can use either <ZK>Not Buffered</> or
<DS:DE.BRF_INVALIDATE>Invalidate</> as the setting for buffering.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.