Hi ,
Is your syntax for CE_COLUMN_TABLE given correctly in view or it is typo in your post?
Syntax:
CE_COLUMN_TABLE(<table_name> [<attributes>])
In your case, it should be like this
col_tab1 = CE_COLUMN_TABLE("SAP_ECC"."VBAK", ["VKORG","VTWEG","NETWR"] );
col_tab2 = CE_COLUMN_TABLE("SAP_ECC"."TVKO",["WEARKS","LIFNR","ADRNR","KUNNR","VKORG"]);
-Siva