Swedish SRU File Generation

Swedish SRU file generation for Skatteverket digital tax filing (INK2, INK2R, INK2S declarations for aktiebolag). Covers the two-file submission structure (INFO.SRU + BLANKETTER.SRU), all SRU field codes for INK2/INK2R/INK2S, BAS-to-SRU account mappings for räkenskapsschema, ISO 8859-1 encoding rules, amount formatting (hela kronor, no öre), 12-digit org number formatting, blankett type period suffixes (P1-P4), #BLANKETT/#BLANKETTSLUT delimiters, #UPPGIFT record format, validation error patterns, and rounding/truncation rules per SFL 22:1. Trigger on ANY question about SRU files, SRU-koder, fältkoder, filöverföring till Skatteverket, INK2S/INK2R generation, BAS-to-SRU map…