Proposal for a shorter EndToEndId in pain.001, or a 3-letter hash for RecId

Dynamics 365 Finance builds the ISO 20022 EndToEndId from voucher, RecId, and attempt counter. Because RecId adds little entropy and can exceed length limits (e.g., India’s 16-character rule), it can be removed or replaced with a deterministic 3-letter base-26 hash derived from its last four digits for safer, shorter identifiers.

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