Structure BAPIE1MARCRTX has reached a critical length

What causes this issue?

The checkbox structure BAPIE1MARCRTX has exceeded 500 bytes since the
underlying user data structure BAPIE1MARCRT has been extended to
include additional fields. As a result, it is no longer possible to
initialize the checkbox structure completely.

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?

In Include LMV01TOP, change the definition of the variable
ANKREUZLEISTE as follows:
Replace the statement <LB>DATA: ANKREUZLEISTE(500).</> with <LB>DATA:
ANKREUZLEISTE(600).</>

Error message extract from SAP system. Copyright SAP SE.