predefined product sales tax Dolibarr 10.0

I am new to Dolibarr any help would be greatly appreciated.
regarding setting up an invoice It seems that if sales tax is applied an agreement between the product settings & the customer settings is required?
-I have setup the tax rules under setup dictonaries.
-I have setup a product with “Default tax rate” and price
-I have setup a company with “Sales tax used” & “Use second tax” as yes
When I create an invoice for this company with a line item of the “Predefined Product” the sales tax field does not autopopulate with the sales tax, in fact the field isn’t there unless I save it then modify or if I use “Free-text item”.

-Shouldn’t tax automatically be applied ot each lne item with these settings?
What am I missing?

Hi ajs,
You have to select also the default tax rate in predefined product selling price tab.