Level 2

Install

Just in case it helps, I was getting the same error, and it was because I'd added an extra line in the items list that I didn't have a Product/Service for, only the description, amount, etc.

 

I created a new Product/Service for the line I was trying to add, and used that instead, and the problem went away!

 

I'm not sure I've explained that very well, but I hope it helps!

 

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