Why groups get messy
In a typical owner-managed group, money moves for convenience. The mainland company pays the free zone company's office rent because it had cash that week. The owner's credit card buys equipment for two entities in one transaction. A supplier invoices the wrong company. None of this is improper, but every one of these movements creates an intercompany balance that someone must record on both sides.
When they are not recorded, each company's accounts look wrong in a different way. The free zone entity shows rent it never paid; the mainland entity shows a cash outflow with no expense. Twelve months later the auditor finds AED 260,000 of unexplained differences and asks for a reconciliation that nobody can build from memory.