Null Cell Formula and N.aN Cell Total

I work with dhtmlxgrid, the latest pro version 4.1.
I define a XML file like these:

<?xml version="1.0" encoding="Windows-1252"?> ..... 31/12/2014 31/12/2013 ... ..... 0 0 ..... ..... =[[0000000400,2]]+[[0000000500,2]] =[[0000000400,3]]+[[0000000500,3]]
      <row id="0000011100">


I have Cell summary of another elementary Cell, and Cell summary of elementary Cell and summary Cell( complex summary).
Into my javascript i write the following instruction:

Since the user edits a cell elementary, cell summary of elementary cell, remains empty, without any value, while complex summary cell contains value N.aN.

What’s wrong?

If inside my XML file define column type=“edn”, instead of type=“edn[=0]”, the value of formula is the string with math formula!!


Thanks in advance, best regards,

The issue was with reassigning the default column type in js part and was solved in the support system.