Purchase: Duplicate Supplier D/O No. or Invoice No

From AutoCount Resource Center

Question: When I want to save a Purchase Invoice, error message prompted “Supplier D/O No. XXXXXX already used in Purchase Invoice PI-XXXXXX” or “Supplier Invoice No. XXXXXX already used in Purchase Invoice PI-XXXXXX”. What can I do to tackle this error?

Version: 1.8 / 1.9 / 2.0

Possible Reason:

The Supplier D/O No. or Supplier Invoice No. you keyed in in this Purchase Invoice already been used in other Purchase Invoice previously.


1. Go to Tools > Options.

2. Under Invoicing tab, look for Customize Invoicing 2, check Allow Duplicate Supplier Document Number option, and then click on OK.

3. Now, you will be able to save the Purchase Invoice without any error.

By: CY 171130, KM 171204, P171206

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