While pushing expenses to Great Plains, you may get the following error -
Timestamp:07/11/2014 14:59:26 Category:Main GP Exception Priority:1 EventId:100 Severity:Critical
Title:Exception while processing GP Upload
Message:GPPayablesInvoiceUpload.cs System.Web.Services.Protocols.SoapException: A validation exception has occurred.
Validation Errors:
- PurchaseTaxScheduleKey does not exist.
- MiscellaneousTaxScheduleKey does not exist.
- FreightTaxScheduleKey does not exist.
Make sure the tax schedule maintenance is selected for GE-TAXID
Also please make sure on the company setup options you have clicked on Specify Tax Details for Automatic Tax Calculation.