One customer group can contain several different debtors
The account uses one familiar customer name
Suppose your team works on several sites marketed under the same group brand. Accounts keeps the invoices together, but the purchase documents name different companies. You are preparing one demand for the whole balance.
Stop and match the invoices to the underlying agreements. A shared logo, office or accounts contact does not by itself establish that every charge belongs in a demand to the same legal party.
Start with the accepted job documents
For each job, locate the quotation acceptance, contract or purchase order and identify the contracting party. Keep the relevant business identifiers and addresses alongside the invoice. Flag documents that conflict rather than choosing whichever name is easiest to contact.
business.gov.au recommends recording the parties' full legal names and business details in contracts. Those details provide a starting point for checking the identity behind a familiar trading brand.
Prepare separate working reconciliations
Allocate invoices, receipts and agreed credits to the relevant account on a supported basis. If a group payment covered several entities, ask for the allocation and retain the explanation. Do not silently move one company's payment to another company's debt.
Have your accountant check unclear accounting entries and obtain legal advice where responsibility is disputed. An internal customer code is a convenient label, not a legal determination of liability.
Check who is being asked to respond
An accounts team may process invoices for several businesses. Ask it to confirm the entity and account involved in each enquiry. Address the demand after the position has been checked, with advice on formal requirements where necessary.
Do not assume a group director personally owes the balances, or that a related business must pay because it is financially stronger. Any guarantee or other basis for recovery needs its own assessment.
Keep future work from adding to the confusion
Confirm the contracting details before accepting the next job or changing the account setup. If the customer requests a different entity, record the request and check the terms before relying on it.
A new name on a future order should not silently rewrite who owes an existing invoice. Keep historical documents intact so the old account remains traceable.
Send a demand that can be reconciled
Give your adviser the entity-by-entity schedule and documents before sending formal correspondence. Explain any uncertain allocation or conflicting identity information plainly.
Use Report a Debt below if CRP is assisting with collection. Provide the actual contracting parties rather than only the group brand. That helps the next conversation focus on the correct account without promising that every related company is available as a recovery target.