If you don't want to activate the "Offline Transaction" feature on the Sell menu, you can configure the settings by follow the steps down below :

Step 1. Go to Setup, click more options, then click Module

Step 2. Go to Sell Tab

Step 3. You can scroll down until you find Offline Transaction

Then you can set Enabled to No just like picture down below :

When you do sell in offline, the restriction will be applied :

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