[DEV] (During import) Group vessel billing and yac only if same partner AND vessel ID
[DEV][TASKS 10152/10153] (only when importing) Group VBL and YAC also by vessel ID
[DEV] (Explicit grouping) Group only vbl and yac when vessel ID is the same
[FIX] Syntax
[IMP] Change VBL fields to related fields
[FIX] Bad condition before grouping
[IMP] More explicit method name
[FIX] Inverted error messages
[FEEDBACK] Change field order + Add vessel ID on yard activity invoice
[MERGE][TASK 10153] Phase 5.1: Add fields and group VBL