AWS Marketplace sellers can now submit multiple, self-service change requests simultaneously using AWS Marketplace Management Portal (AMMP) or AWS Marketplace Catalog API. Now, AWS Marketplace sellers can start multiple self-serve change requests for AMI, Container, Professional Services, and Machine Learning products via AMMP, and via the AWS Marketplace Catalog API for AMI, and Container products. Sellers will no longer have to wait to submit a subsequent change request for a product while prior change requests are in progress. For example, if a seller wants to update product information and version information of their product, they can now submit these requests one after another in quick succession without having to wait for the first request to complete.
Source:: Amazon AWS