Hi Ishana,
There is a hot fix available for download from the partner area of the website (dated June 26), that addresses the issue of data conversion from a version of Receivables 8.1A or older, directly to version 9.1A.
I don't recall whether simply installing the hot fix allows the data to open, or whether you need to restore and re-convert the AR data.
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Regards,
Softrak Tech Support