Positions. Quantity and average cost per account and security, e.g. from the custodian. Each loaded position replaces the open lots with one lot at the average cost. Use the lots data set to keep lot detail. Key: account + symbol. One file: the header attributes, then the records. The business date the data is for (YYYY-MM-DD). Your firm code, shown on Data › Feeds (e.g. F00012). Who produced the file (vendor or system name). When the file was produced (UTC). The number of record elements. A file whose count does not match is refused (F004): it was probably cut short. delta: only the records in the file change, and action="delete" removes one. full: the file is complete; records it does not list are inactivated, up to the feed's safety threshold. One positions record. Elements may appear in any order. The account code. Part of the key. A code: letters, digits, "_", "." or "-", up to 20. Part of the key. The security. Part of the key. A ticker symbol: letters, digits, "." or "-", up to 12. Part of the key. Shares held (negative for a short). A decimal number written as text, e.g. 1234.5. Average cost per share. A decimal number written as text, e.g. 1234.5 (min 0). The date of the position (the lot's acquired date for tax purposes when no lot detail is given). An ISO date, YYYY-MM-DD. upsert (insert or update by key) or delete (removes the record; a security or account is inactivated, never deleted).