Industry Members may resubmit the same record each business day but are not required to. If an Industry Member resubmits an identical record to one that already exists in CAT CAIS, CAT CAIS will overwrite the previous record with the new record with the same information. 

For the LTID Phase, it was permissible to exclude optional or conditional attributes previously submitted for an FDID or LTID, and no implicit update was made to these values stored in CAIS. If an Industry Member intended to clear a previously submitted value, it was required to use the paired NULL attribute for the field. 

For the Full CAIS Phase, Industry Members are required to include all attributes and associations for each record within the file. Industry Members are still only required to include records in their submission when changes occur to Active Accounts, however each record present in the file must contain the current state of attributes and associations of the record. The sole exception to this inclusion of all current attributes and associations is Customer associations that were previously stored, where the FDID is not included in the current submission but at least one of its associated Customers is included. For example, suppose a Customer Record was associated to both FDID 1234 and FDID 5678 and was previously accepted by CAIS. Later, the Industry Member must submit required updates for FDID 1234 but there were no changes to FDID 5678. All current attributes and associations for FDID 1234 must be reported to CAIS. Despite having a common Customer, the Industry Member is not required to submit all current attributes and associations for FDID 5678 because there are no changes to this FDID. Please see the Customer and Account Technical Specifications for Industry Members- Full CAIS for more information.