Question about interface_header_attribute6

 from doc 1365401.1 it says

Customer is saying sometimes line field (interface_header_attribute6)cause multiple invoices. Is this true?  and interface_header_attribute6 seems to be populated from interface_line_attribute6

and I also have a same delivery id can seperated into 2 invoice because of the different interface_header_attribute6

My grouping rule contains interface_line_attribute1-3, 

and my SR reply suggest me to disable interface_header_attribute6 .

"To prevent this issue in future, I would suggest you to disable the interface_header_attribute6 in invoice transaction_flexfield and also make sure that interface_header_attribute6 is not populated in AR interface when the records are interfaced from OM to AR."