# Relational Tables in Case Files: Why They Matter for RAG Systems How cross-document relationships in case files challenge traditional AI document processing - **Source:** [Towards Data Science](https://towardsdatascience.com) - **Published:** 2026-08-23 - **Topic:** [Data & AI](https://brifing.si/c/data-ai) - **Original article:** - **On Brifing:** https://brifing.si/s/1bfa077e-5d13-4dd3-9ea4-2238f8559cd1 ## The unique structure of case files Insurance claims, loan applications or medical records consist of completely different document types. For example, a fire claim file might contain adjuster reports, photographs, repair invoices and policy documents in the same folder. This heterogeneous structure challenges traditional document processing systems as each document type contains different data structures. ## The missing document problem When reviewing a file, an insurance specialist first checks a 'required documents checklist'. For fire claims, a fire brigade report is mandatory. While AI systems can automate this check, searching for a non-existent document is impossible with traditional retrieval methods. Systems need to learn case-specific rules to detect 'absence'. ## Cross-document inconsistencies One of the most critical issues in case files is inconsistencies between documents. For example, the loss date on a claim form might not match the inspection date in the adjuster's report. Detecting such conflicts requires systems to compare specific data points across different documents - a weakness of traditional RAG systems. ## Evolution in document intelligence Document processing systems are moving from single-file analysis to case-file level. Even 200,000-token context windows aren't enough alone because systems need to understand inter-document relationships. For example, a fire claim for a joinery workshop might contain 11 different PDFs, each with distinct data structures. ## Relational table extraction An effective RAG system should create two key tables for case files: A table of expected document roles and a table of arrived files with assigned roles. For insurance claims, 'adjuster report' is a mandatory role. By defining these roles, systems can both detect missing documents and identify cross-document inconsistencies. ## Structured data model Systems processing case files use specialized parsers for each document type. Form fields, free text in reports, and tables in invoices all require different processing approaches. These parsers output standardized relational tables that enable cross-document analysis. ## Industry application example An insurance company analyzing fire claims processes average 60-page files. Their system first checks for 12 required document types, then compares 5 critical data points across documents. This reduced missing document rates by 42% and inconsistency detection time by 67%. ## Comparison with other architectures Traditional RAG systems face three key challenges with case files: 1) Can't search for missing documents 2) Overlook inter-document relationships 3) Struggle with reliable mid-context processing in long windows. The relational table approach solves all three by processing data in structured form. ## Case-type specific rules Each case type (insurance claim, loan application etc.) requires different document sets and validation rules. Fire claims might expect two repair invoices while loan applications need 3 months of bank statements. Systems need case-specific templates and business rules engines to learn these requirements. ## Confidence score calculations Confidence intervals are crucial when assigning documents to roles. A document might be 85% likely an adjuster report and 10% likely a claim form. Systems use threshold values to manage these uncertainties. The insurance industry typically prefers >90% confidence, keeping misassignment rates below 1%. ## Automation ROI impact Companies automating case file analysis report 55-70% reductions in processing times. One insurer reduced average fire claim resolution from 14 to 5 days, achieving $2.3M annual operational savings. Erroneous payment rates dropped from 12% to 4%. ## The future of enterprise RAG Document intelligence systems are advancing from single-file to case-file level processing. By 2025, 40% of the enterprise RAG market will demand this capability, led by insurance, healthcare and finance sectors. The key success factor will be developing systems that understand inter-document connections through relational tables. ## Sources covering this story - https://towardsdatascience.com/parse-the-folder-not-just-the-pdfs-the-relational-tables-rag-needs-on-a-case-file/ — --- _Summary written by Brifing from the original reporting. Copyright in the original article belongs to its publisher; read the full piece at the link above._