During a two-month period, Niels Sejthen enhanced documentation and backend features across MicrosoftDocs/dynamics365smb-devitpro-pb, microsoft/BCTech, and microsoft/BCApps repositories. He updated Excel report metadata documentation to improve clarity and traceability for Dynamics 365 SMB exports, focusing on metadata properties and execution context. In backend development, he implemented PDF attachment and e-invoicing support, enabling password-protected PDFs and primary XML designation for ZUGFeRD/Facturex compliance. Niels refactored code for maintainability, removed obsolete files, and introduced new API endpoints for PDF handling. His work, primarily in AL and Markdown, demonstrated depth in Business Central development, documentation, and standards-driven report workflows.