hello
If you want to maintain different column.
create one more field Structure and fetch the same way like BWART = '951'
In main table create one more field as BWART1 form 952.
Update the main table using Read Statement.
Hope you understood.
If you want to combine 951 and 952 No problem same query you can use but in operator you have to use select * from table where bwart in required types.
Hope you understood.