If orders are submitted with information that is different from the accounts that are in Adobe's system, a new account is created.
Orders are entered in the reseller’s system and transmitted electronically to Adobe. Purchases made under a CLP agreement always have the correct end-user ID. The system then tries to match an existing deploy-to ID. To use an existing deploy-to ID, there must be a 100% match with the organization name and the entire address. Any discrepancy results in a new ID being created. Some resellers can specify the deploy-to ID that they want the order to end up in. If they can, it is the best way to make sure that an existing deploy-to ID is reused.
For orders made under the TLP program, a similar matching mechanism is used. However, it's necessary that the EUID matches as well, as there is no agreement that can be used to find the correct EUID.
For purchases under the FLP program, orders are transmitted manually to Adobe and entered into the system on this end. The system suggests existing IDs if there is a high enough percentage of a match, but again it is important that the information be provided consistently.