Caution: The table is cross-client

What causes this issue?

You are in the process of maintaining a cross-client table. You are
using the standard table maintenance screen here, which is frequently
used to maintain client-specific Customizing entries. This message
serves to warn you that each change you make will have an effect on all
other clients in the system.

System Response

You have the authorization required for cross-client maintenance.

How to fix this error?

Think carefully about the effect of your changes. Due to logical
dependencies between client-specific Customizing and applications data
on the one hand and cross-client Customizing data on the other hand,
changing or deleting cross-client data could result in inconsistencies.
Therefore such changes should be carefully planned and coordinated,
taking all the clients in the system into consideration.

Error message extract from SAP system. Copyright SAP SE.