readexcelsheet function was taking only first 250 columns in uploaded template

Certified Senior Developer

when trying to upload a template with 500 lines of data the readexcelsheet function was calling in interface to read those 500 lines in that only first 250 lines was fetching the function other 250 was not reading tried providing paging info too but still same only first 250 lines was reading 

Could you please confirm what could be the reason for this issue

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