Needs some tips with Inventory Valuation to Excel

dn

I want to add a feature so user can export the Inventory Valuation to Excel.
I succeeded to export items to Excel if only they are just few items. The problem is when there is a lot of items to run, that need multiples page, like whole Inventory Posting Group then I gett error
"The Excel Buffer already exists ...Identification fields and value
Row No = '4',Column no= '5'"

Someone who can give some advice where I should put linecounter so it don't reset when there is pagebreak?
Now I put code to fill Excel buffer in Section in Item Header, Value Entry Footer, Item Group Footer and Item Footer.
Code for
CreateExcelbook();
is put in Report OnPostreport.

Someone who can give me some advice so I can move on with this report??
](*,)

I used Automation programming instead...Excel Buffer seems not good enough