SAP HANA - How to run alter table statement in HANA procedure?

I am trying to run alter table statement in a procedure. HANA gives error saying

SAP DBTech JDBC: [257] (at 1338): sql syntax error: ALTER TABLE is not allowed in SQLScript: line 36 col 8 (at pos 1338)

How to run alter table statements in procedure?

Thanks,

Suren.