Data Migration to 1C from Legacy Systems

Data migration to 1C is not just file loading, but a project focused on master data quality, mapping rules, and validating business balances. For standard routes such as UT 10.3 -> UT 11 and BP 2.0 -> BP 3.0, there are built-in migration tools, but they transfer data "as is," including duplicates and broken links. If old tables are moved into a new database without cleansing, the company will get the same chaos in a different interface, so before starting we define:

• migration path: a standard move between configurations or a transfer from a custom-built system;
• migration scope: only master data and balances as of a specific date, or also document history;
• the balance transfer date and the operating procedure during the transition period while both databases are live;
• the master data owners and the person who approves reconciliation results;
• cleansing rules: what counts as a duplicate and where archived records go.

Item master, counterparties, contracts, balances, orders, documents, sales history, warehouse data, and core directories. Before migration, we define the sources, owners, and duplicate-cleansing rules. We choose the tool based on the route: built-in migration tools, Data Conversion, or custom exports for nonstandard sources.

• master data: item master, counterparties, contracts, warehouses, cost items;
• balances as of the transfer date: goods by warehouse, settlements, and cash;
• open documents: unclosed orders, invoices, and undelivered sales;
• sales history, only in the volume needed for analytics, not "everything just in case";
• accounting policy settings and account mapping, if the chart of accounts changes.

We check required fields, formats, relationships between entities, archived records, invalid taxpayer IDs, duplicate counterparties, overlapping item master entries, and discrepancies between management and statutory accounting.

Go-live in the new 1C happens without manual rechecking of the entire database: the team understands which data was transferred, which was cleansed, and which requires a separate business decision. Reconciliation is done through reports: balances and settlements in the new database match the legacy one as of the transfer date, not "by eye."

• master data is cleansed: no duplicate counterparties or overlapping item master entries;
• warehouse balances and settlements are confirmed by reconciliation as of the transfer date;
• there is a migration log: what was transferred, what was cleaned, and what stayed in the legacy database archive;
• the team works in the new 1C without duplicate entry or switching back to the legacy system.