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?

  1. What is about Tax identifier?

  2. show all fields and you can see sales&purchase Tax Account. I think it is empty.

Where am I showing all fields? I am looking for this option but don’t see it. I don’t know where to find the sales VAT account