Mandatory e-document submission on eSANCHIT requires invoice and transport document IRN references in every Bill of Entry. Mandatory uploading to eSANCHIT requires that every Bill of Entry include the uploaded Invoice/Invoice-cum-packing list and the relevant transport contract, with the corresponding document code and IRN declared in the Bill of Entry; other supporting documents (e.g., certificates of origin, licences from Participating Government Agencies) must be submitted electronically via eSANCHIT by beneficiaries or PGAs and physical copies should not be accepted.