Buffer was filled with & rows & columns

What causes this issue?

You copied a block consisting of one or more elements to temporary
storage in the displayed size.

How to fix this error?

Temporary storage can only be used while the transaction is active. For
this reason, elements can only be copied to a different screen if you
choose this with <LS>Get</> or return to the initial screen of the
Screen Painter with <LS>Back</> and modify the new screen there.

Error message extract from SAP system. Copyright SAP SE.