title: dropdown Validation not working if it exceeds 50 rows in the Export To Excel
body: <p>I am generating Excel File(.xlsx) using apache poi jar (poi-ooxml-3.9.jar), I added dropdown validation for 10 columns in my excel file, If I generate the Excel File with 50 rows, drop down validation is working. If it exceeds more than 50 rows, drop down validation is not coming in the Excel File, When I open the excel File I get the message as "<strong>We found a problem with some content  in fileName.xlsx. Do  you want us  to try  to recover as much as we can ? If you trust the source  of this workbook, click Yes</strong> ". when click on Yes, all the dropdown validation it is removing. Kindly need solution to fix this issue.</p>