Hi Herman Pfisterer

Since it looks like you are using Sage 50 US, I am going to move this post to that Support Group so that other users of this software will see it and can offer you their thoughts and insight.

Tip from this article, that another  AvaTax resource that may be of use is the Sage Partner Solution Source: http://sagepss.com/Solution.aspx?SolutionID=5444.

Thanks,

Erzsi