Tradacoms is an early standard for EDI (Electronic Data Interchange) primarily used in the UK retail sector. It was introduced in 1982 as an implementation of the UN/GTDI syntax, one of the precursors of EDIFACT, and was maintained and extended by the UK Article Numbering Association (now called GS1 UK).
| Application Reference | Message type |
| ACKHDR | Acknowledgement |
| AVLHDR | Availability Report |
| BTOHDR | Book Trade Orders |
| PVUHDR | Book Trade Price/Availability Update |
| CAKHDR | Claims Acknowledgement |
| CLAHDR | Claims Message |
| CORHDR | Complex Order |
| CREHDR | Credit Note |
| CREADV | Credit Advice |
| CUSHDR | Customer Information |
| DEBADV | Debit Advice |
| DLCHDR | Delivery Confirmation |
| DELHDR | Delivery Notice |
| DYEHDR | Dye Instruction |
| GENHDR | General Communication |
| HSOHDR | Home Shopping Orders |
| INVFIL | Invoice |
| ISSUES | Issues |
| LPRHDR | Location Planning Report |
| PICHDR | Picking Instruction |
| ORDHDR | Purchase Order |
| PAYORD | Payment Order |
| PRIHDR | Price Information |
| PROHDR | Product Information |
| PPRHDR | Product Planning Report |
| RDAHDR | Retailer Database |
| RDBHDR | Retail B, 1-4 Retailer Database |
| RIFHDR | Retail Issues File |
| SADHDR | Stock Adjustment |
| SNPSTS | Stock Snapshot |
| SRMHDR | Statement & Remittance Details |
| SORDET | Supply and Returns Details |
| SORDAY | Supply and Returns Summary |
| SRSHDR | Supply and Returns Summary |
| RIFHDR | Retail Issues File |
| UCNHDR | Uplift Confirmation |
| UPLHDR | Uplift Instruction |
| UTLHDR | Utility Bill |