Table dynpro & & already exists

What causes this issue?

The table maintenance screen already exists and was therefore not
generated again.

System Response

Any changes made to the table in the ABAP/4 Dictionary, e.g. addition
of new fields, cannot directly be taken into account.

How to fix this error?

In such cases, you must first delete the table screen and then generate
it again. Any changes in the screen must be taken into account and
maintained accordingly.

Error message extract from SAP system. Copyright SAP SE.