Thanks Thomas, after update of system configuration as you indicated the following DML invoking procedure created from new source editor now works:
CREATE PROCEDURE create_table_purchase_item_sql ( )
LANGUAGE SQLSCRIPT
SQL SECURITY INVOKER AS
--DEFAULT SCHEMA <schema>
BEGIN
/*****************************
Write your procedure logic
*****************************/
drop table "MISSIONCONTROL"."hpl.missioncontrol.data::MC.Purchase.Item";
create column table "MISSIONCONTROL"."hpl.missioncontrol.data::MC.Purchase.Item"(
PurchaseOrderId NVARCHAR(10),
PurchaseOrderItem NVARCHAR(10),
ComponentId NVARCHAR(5),
Currency NVARCHAR(5),
GrossAmount DECIMAL(15,2),
Quantity DECIMAL(13,2),
DeliveryDate DATE,
primary key(PurchaseOrderId, PurchaseOrderItem));
END;