Documentation 19.0

Fill in a contact record properly

Merge duplicate contacts

2 min read Updated 2026-08-14 WindoorERP 19.0

What this does

Folds duplicate contacts into one record without losing their documents, so a customer stops appearing three times and being chased by two salespeople.

Before you start

  • Merging cannot be undone. Open each record first and be certain they are the same party.
  • Two companies with similar names are not duplicates. Check the tax ID before merging anything with accounting history.

Steps

The Merge option in the Actions menu.

The merge dialog listing the selected contacts.

  1. 01
    Open the Contacts app and switch to the ☰ (list) view.
  2. 02
    Tick the checkbox of each duplicate.
  3. 03
    Click the ⚙ (Actions) icon and choose Merge.
  4. 04
    Review the list in the dialog. Remove anything that does not belong with the 🗑 (delete) icon at the right of its row.
  5. 05
    Set the Destination Contact — the record that survives. It defaults to the oldest one.
  6. 06
    Click Merge Contacts.

Find the rest of the duplicates

The confirmation offers Deduplicate the other Contacts, which hunts for duplicates across the whole database. Choose the fields that define a duplicate for you — Email, Name, Is Company, VAT, Parent Company — remembering that selecting several means a record must match all of them.

You can also exclude candidates that have a user account or accounting entries attached. Then pick Merge with Manual Check to approve each pair yourself, or one of the automatic options.

Common mistakes

  • Running an automatic deduplication on name alone. Two different people share a name more often than you think.
  • Choosing the newer record as the destination and losing the reference the accounts team has been using for years.
  • Merging a company into one of its own child contacts.

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