BR-06 / BR-07 — Seller and buyer names

The single most common mapping failure: the ERP export carries the trading name where the standard requires the party name, and the platform rejects the document outright.

• Flags a missing BT-27 / BT-44 as blocking and shows exactly which side is incomplete.
• Adds an advisory when no separate registered/trading name (BT-28 / BT-45) is present.
• Also checks the postal address the name pairs with (street, post code, city, country).