Advance remittance and documentary evidence rules govern bank obligations for import payments and due diligence compliance. AD Category I banks must ensure imports comply with the Foreign Trade Policy and FEMA rules, apply standard documentary credit practices, perform KYC/AML due diligence, and obtain prescribed import evidence. Advance remittances for goods and services are permitted without an absolute ceiling but require bank guarantees or standby letters of credit for higher exposures, with sectoral relaxations and reporting obligations. Imports of precious metals and stones carry specific cash margin, usance and documentation controls, and banks must follow up and report defaults in submission of import evidence to the Reserve Bank.