Delete items in reconfigure causes loss of subsequent line item updates from quote

Content

Our quote LIG has a couple fields that can be updated with line specific information that aren't part of configuration.  If we reconfigure and delete a line, when we return to the quote. All lines after the deleted line lose their line item updates.

The doc numbers get reassigned to subsequent lines after the deleted lines.  

example:

_document_number

2   (config)

3    line 1

4    line 2

5    line 3

if I reconfig and delete line 2 (document number 4) , the result is

2   (config)

3    line 1

6    line 2  (previously line 3 with document number 5.  now it's document number 6)

I'm guessing that if the document number didn't get reassigned for subsequent lines, then the commerce LIG updates would not be lost.  Is there a way I can make reconfig retain the _document_number ?