Mapping table

A mapping table is a structured list that shows how one set of values, fields, identifiers, or codes corresponds to another set. In manufacturing and enterprise systems, it commonly refers to configuration or reference data used to translate information between applications, data models, or process steps.

A mapping table can be as simple as linking an ERP item code to an MES material identifier, or as detailed as converting defect codes, unit-of-measure values, work center names, status codes, or supplier IDs across systems. It is used to support consistent data exchange, reporting, and system interoperability.

What it includes

• Field-to-field relationships between systems

• Code translations, such as status, reason, defect, or location codes

• Value normalization rules, such as standard names or approved abbreviations

• Cross-reference records used in integrations, migrations, or reporting layers

What it does not mean

A mapping table is not the same thing as the integration logic itself. It usually holds the reference relationships that the integration, ETL process, middleware, MES, ERP, or analytics layer uses. It is also not necessarily a full data model, master data record, or transaction history.

Operational meaning in manufacturing systems

In regulated and multi-system environments, mapping tables often appear wherever data must stay aligned across MES, ERP, PLM, QMS, LIMS, or warehouse systems. Examples include mapping part revisions between PLM and ERP, associating shop-floor equipment IDs with enterprise asset records, or translating nonconformance codes into reporting categories.

Because mapping tables influence how records are interpreted, they are often treated as controlled configuration data. Changes to them can affect traceability, reporting consistency, interface behavior, and downstream business rules.

Common confusion

Mapping tables are commonly confused with lookup tables, crosswalks, and master data:

• Lookup table: usually provides allowed values or descriptive labels within one system.

• Crosswalk: often means a direct correspondence list between two coding schemes and may be used as a synonym for mapping table.

• Master data: is the authoritative business data itself, while a mapping table links or translates between representations of that data.