IGM transmission rule: custodial IGM messages sent only after entry inwards, enabling auto-approval for container movements. IGM messages will be sent to custodians only after grant of Entry Inwards; amendments before entry inwards need no Assistant Commissioner approval, while amendments after entry inwards require such approval. Movement requests to CFS/ECY must be included in IGM Message 1B with specified fields (CFS/ECY code, nature of cargo 'C'/'CP', cargo movement 'LC', bond registration number, and MLO code) for ICES to auto-approve container movement at entry inwards. Transit/General/Container bonds will be debited based on container ISO/type and recredited on verified exit or re-export; post-approval amendments are limited and gate-tracked.