According to the query result from the CRD7 table after I created a new BP with TaxId0 on the B1 screen , there is always an additional line with empty address name in the top of the CRD7 table, so, it comes to my below questions.
1. Do I need to prepare a dummy line accordingly in the DTW template when I import BP by using DTW or the XMLinterface of B1?
2. What is the top line in the CRD7 table used for?
3. Why TaxId0 only appears on Ship-To address?
PS: I checked B1 DI-API reference and all relevant SCN note, there are lack of information about this. I think SAP should really improve this and especially to the ugly "LineNum" almost handling for all B1 objects in B1. Such as BPAddresses CRD1.LineNum(<RowNum>)