Thanks for reaching out to the Community, LeesaMobile.
 

I can certainly understand how an ability to turn off warning messages about serial numbers while creating invoicves could be useful and have submitted a suggestion about it as of today.
 

You can also submit your own feature requests while signed in.
 

Here's how:
 

1. In the top menu bar, go to Help, Send Feedback Online, then Product Suggestion....
   
   
    
2. Choose a Type of Feedback and Product Area (optional) from your available drop-down menus.
   
   
    
3. Enter any suggestions/feedback in the Here is my suggestion: field.
   
   
    
4. If you'd like, include your name/email in the My name is: (optional) and My e-mail address is: (optional) fields.
   
   
    
5. Select Send Feedback.
   
   

Your feedback's definitely valuable to Intuit. It will be reviewed by our Product Development team and considered in future updates. You can stay up-to-date with the latest news about your product by reviewing Intuit's  Product Updates webpage.
 

As a workaround, you can dismiss when when they display for you.
 

Please don't hesitate to send a reply if there's any additional questions. Have a great Thursday!