On 8 August 2015, the IRS issued an updated version of FATCA International Compliance Management Model (ICMM). The new ICMM validates record-level processing of FATCA 8966 XML files, including report files submitted before 8 August to correct two known errors regarding “Account Holder Type Not Valid” and “Pooled Reporting Type Not Populated”.
Based on the guidance, no response is required by the filer to the abovementioned error messages. The IRS will correct and send notifications for concerned files.
Additional information on this issue can be found under the “Q1” and “Q2” references of the “Field Level Errors” category of the Frequently Asked Questions (FAQs) (Link).