When documents are imported using the TE Document Import window the final step in the import is to call the DocPost method to flag the document as a posted document. This method sets the TaxEngine posting date to the current system date.
This fix includes overloading the DocPost method with a new signature that allows the posting date to be provided as a parameter. Now when the imported document is flagged as posted during the import process the TaxEngine posting date is set to the actual Microsoft Dynamics GP posting date.