Error when locking table & (return code &)

What causes this issue?

Before selecting data to create an INTRASTAT declaration or to process
a data extract manually, the system must block table VETAV, which
causesa problem.

System Response

The system issues an error message. No data is selected to create the
INTRASTAT declaration, or the data extract cannot be processed
manually.

How to fix this error?

Return code 2 : The table is currently being processed
Return code 5 : A system error has occurred

Error message extract from SAP system. Copyright SAP SE.