excel not releasing

I have created an excel document using Progress.
I have included the appropriate RELEASE statements,
RELEASE OBJECT chExcelApplication.
RELEASE OBJECT chWorkbook.
RELEASE OBJECT chWorksheet.
RELEASE OBJECT chChart.
RELEASE OBJECT chWorksheetRange.
Though windows still has not released the document. It is still being used.
Any help would Be great thankyou.
TIA
 
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