When i tried to deploy a webpart to a webapplication using both PS and Central Administration,i got the following warning:
This solution contains no resources scoped for a Web application and cannot be deployed to a particular Web application.
It tried to deploy it to GAC which i didnt want.Because it needs to be deployed to a WebApplication in my farm
DeploymentTarget property needs to be set as “WebApplication”.Even though i changed it via project properties,it kept changing to GACDeployment so i had to edit Package xml.Just to be sure.
After deployment i got to choose the webapplication where i want it deployed.
Hope it helps