SAVE not required, no data modification (& &)

What causes this issue?

It is only possible in document maintenance to save temporarily stored
data from the quantity schedule in the database. Use the SAVE function
in document maintenance.


&SYSTEM_RESPONSE& / &SYSTEM_MESSAGE&
This message is controlled by Table T160M. It provides additional
information in the quantity schedule. If the message type contains "W",
a "success message" appears; if the message type contains "E", a
warning message appears (default is "W").

How to fix this error?

Nothing (no special steps are required).

Error message extract from SAP system. Copyright SAP SE.