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We are developing a managed package and I am working on a batch class which has been packaged in dev enviroment and our app is deployed to our testing org as well.
Currently return type of start method is List < sObject > and now we need to change it to Iterable < WrapperClass >, will it cause any problem while upgrading package in that testing org.
global methods cannot have the number of parameters, the type of parameters, the return type, the access level, or the name of method altered after a successful Released version upload. In the future, consider making your methods public unless they need to be accessible outside the Managed Package. It is legal to make a global class with public methods for implemented interfaces to avoid this problem. Unfortunately, it's too late to change it now, unless you're able to somehow rollback to a Beta package, which involves uninstalling the any later package version from all orgs where the package is installed.
global?