[WIP] certs

Elwig/Documents/BusinessDocument.cs

@@ -125,7 +125,7 @@ namespace Elwig.Documents {
                     .Item(c.Address).Item($"{c.Plz} {c.Ort}").Item("Österreich").Item("Tel.", c.PhoneNr).Item("Fax", c.FaxNr).NextLine()
                     .Item(c.EmailAddress != null ? link1 : null)
                         .Item(c.Website != null ? link2 : null)
-                        .Item("Betriebs-Nr.", c.LfbisNr).Item("Bio-KSt.", c.OrganicAuthority).NextLine()
+                        .Item("Betriebs-Nr.", c.LfbisNr).Item("Bio-KSt.", c.OrganicAuthorityCode).NextLine()
                     .Item("UID", c.UstIdNr).Item("BIC", c.Bic).Item("IBAN", c.Iban)
                     .ToLeafElements());
         }