Amazon does not require you to provide box-level content for shipments that only have one box. It is recommended, if you are already aware you will be doing a single box shipment, to leave the Box Content setting turned Off for your batch in Stratify.
We know that it's not always possible to know in advance if everything will fit in a box, so we would like to explain a little more about what happens when you choose to turn On Box Content in Stratify for a batch, what you will see in Seller Central, and most importantly, that it's still okay to complete your shipment this way.
Turning the Box Content feature to On in Stratify alerts Amazon that you intend to send your box-level content information over to them in something called a feed. At that time, Amazon's systems select Multiple boxes and Amazon Marketplace Web Services automatically and turn off the ability to alter them.
This is because they assume you are sending multiple boxes (since box level detail is not needed on single box shipments) and the feed previously mentioned is received by them through that Amazon Marketplace Web Services API.
If you are not sure if your shipment will contain more than one box, that is okay! You can still the Box Content feature On in Stratify, you'll just need to provide the information for the one box within our application and transmit that info over to Amazon before completing the shipment.
While there is not a way to change this setting, since Amazon has grayed it out automatically, it does not stop your ability to calculate your costs, print your label, and create/complete your shipment. In the long run, you are simply providing Amazon with just a little more detail than they need for that particular shipment.
For steps to help enter box-level content using Stratify, please check out the Box Content portion of our User Guide.