The placement of Next button in app for warehouse men

The app will be used on an Android device with touchscreen but physical keyboard. The device allows for bar code scanning so there's also a handle for more comfortable usage. There are a few steps that warehouse men have to perform in order to complete an activity of registering items delivered to stock. For each step they can either type information and click "Next", or they can scan the information and be moved to the next page automatically. The client wants to have the summary of all steps visible on the screen constantly and there you can click on each of the info and edit if needed. The idea is as below:

So the question is, how to place the Next button in this case? We use Next only if we input information manually, otherwise it is done automatically. In the first screen it seemed logic that Next would be placed just next to a text field but then it is not consistent with other type of pages (2). If I place the next button at the bottom, it looks a bit odd on the pages like the first one.