AWS CodePipeline announces the ability to start a pipeline execution with source revision overrides. Until today, a manually started pipeline execution would automatically select the “latest revision” for each source in the pipeline. The “latest revision” depended on the source action type. For example, for a CodeCommit source, the HEAD commit reference in the configured repository and branch was used, and for Amazon Elastic Container Registry (ECR) source, the latest digest of the configured image repository and tag was used. Now, when you start a pipeline execution, you can override the source revisions for the source actions in your pipeline.
Source:: Amazon AWS