Customer Interface - The address reference specified is not valid for this customer reference

We have recently upgraded from 11.5.10.2 to 12.1.3 and are now getting sporadic failures in the Customer Interface with the message "The address reference specified is not valid for this customer reference"

Customers are interface from a source system and we populate the following 3 tables

- ra_customers_interface

- ra_customer_profiles_interface

- ra_contact_phones_interface

In our situation customers have 1 site and 1 address.

We always populate orig_system_reference and orig_system_address_ref with the customer account number and the interface population is essentially unchanged from 11i to R12

The customer account number is always 6 numeric digits.

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I can see why we the error message is happening.