Hi, I re-tested with my team and confirmed that it works today. Thank you sorry for the late reply.

Hi @Clarisa De Torres-Oracle , Thank you for your SuiteAnswers article 67932. I tried but the answer is the same. The import only updated 1 line, not 2. Thanks. Sample with logs attached.

Sure. I tried to update the address phone for this customer but it only works the first line, not the 2nd line. Internal ID CustNo Address Phone Address Internal ID 5316 C018029 (210) 881-6111 150261 5316 C018029 (210) 881-2222 56178 Charlie

This import update method works on multiple customers per line, however when you have multiple lines for each of the customer, it only updates 1 line per customer, the rest are not. Charlie