Add VAT rate resolution and VAT amount difference for E-Document purchases

[ventselartur]

Why

When processing incoming e-documents (e.g., PEPPOL invoices), the system previously did not resolve VAT Product Posting Groups from the VAT rate extracted by the document intelligence service, nor did it reconcile VAT amount differences between the document's total VAT and the computed line VAT. This meant users had to manually assign VAT posting groups on every draft line and could not automatically handle small rounding-based VAT differences — a tedious and error-prone process for high-volume purchase invoice processing.

Summary

• Added two new setup fields on Purchases & Payables Setup — "Apply VAT Diff. For Purch. E-Doc." and "Resolve VAT Product Group for Purch. E-Doc." — both defaulting to enabled
• Added VAT Product Posting Group resolution during draft preparation, matching extracted VAT rates to VAT Posting Setup entries (Normal VAT and Reverse Charge only)
• Added VAT amount difference computation and application to purchase lines when finalizing the draft, distributing the difference proportionally across lines
• Added smart VAT rate extraction from ADI structured data, preferring the taxRate field and falling back to the tax field with disambiguation logic
• Added "[BC] VAT Prod. Posting Group" field on E-Document Purchase Line with filtered lookup
• Added activity logging for VAT rate resolution outcomes (matched, mismatched) and VAT difference application decisions
• Added upgrade codeunit to enable both VAT options for existing installations
• Updated E-Document Purchase Draft page to show the applied VAT amount difference
• Updated existing structured validation tests to reflect corrected VAT rate expectations (percentage vs. amount)
• Added comprehensive test codeunit (E-Doc Purch. VAT Tests) covering VAT group resolution, mismatch handling, Full VAT exclusion, Sales Tax exclusion, and Reverse Charge matching

AB#636587

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