Hi Amy,
I do not think that there is any IO related to AUFSD 'Order type block indicator (for example, only cash sales)'. So you will have to do following:
1. Create new IO for AUFSD.
2. Include it in Attributes of 0CUST_SALES
3. Replicate your changed datasource in BW system.
4. Map the new field with new attribute of 0CUST_SALES. And then test the data.
Please let me know if there are any questions.
Thanks
Amit