Setting up the tax. Business central

I am in the implementation/setup process of a brand new company. I have my purchases side working and posting correctly however, every time I try to post a sales invoice i get this error message.

  

My tax appears to be correct in all the posting tables, there are no zero values anywhere.  I looked in all the tax posting tables, customer and GL account for the GST and still nothing. 

Any ideas? 

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