Sir, in gst validation error shows?

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Sir,

    A person is dealing in leather business, he stay in Assam collect leather from bihar , after purifying that leather again sell it to Bengal.

     Now the person get register in gst, now the problem is that he purchase product without bill as per his statement from whom he purchase no bill used to be made for such leather.

        NOw what to so in this case how sales and return can be upload in GST how ITC will be claim.