Is it possible to use UDO to integration for B1i?

Question

According to standard integration process, data is transfered from IDOC from R/3 to business object to SBO using standard BIU.
I think it is difficult to integrate data which is not include standard SBO data using B1i. Because UDO of SBO can have only one UDT. 
If UDO can be used to integrated with B1i, how can integrate multiple table which is not SBO standard?
Also if UDO can't be used and UDT can be used to integrate, what's the method to integrate that kinds of data?
If B1i support only UDT integration, how can be transfered data in case of not standard BIU is not used?
Other data which is not included to standard business object of SBO can not transfer through own business object.
So in this case, BIU should use only UDT not UDO?

Answer 1

Hello SJ,
You are right that BIU help to transfer the IDOC to Business Object in B1. And SAP deliver some BIUs for the four integration scenarios -- Item Master Data, Business Partner Master Data, Local Stock Sales and Central Stock Sales. I think "standard BIU" in your questions refer to these BIUs provided by SAP.
If you want to use B1i in your customer's specific project, there could be a new integraion scenario. In this case, you need to develop new BIUs. For instance, if customer want to integrate GL Account between headquarter and subsidary, you need to develop a, or several, BIU for this scenario. And in the BIU, it will transfer IDOC to standard B1 GL Account object.
However, as you said, it might be possible that user have their own tables in B1, and they want to integrate these tables with R/3 system. In this case, if the table is UDT, they will handle the table the same as standard business object (like the GL Account sample). And if the table is not created as UDT, they will use SQL in BIU to update them in B1 DB.
The last point I would like to mention is that B1i does not support UDO, only UDT.
Hope this helps,
Nick