This version is compatible with SAP 9.3PL 12

Added log entry for SAP document type

The SAP document type is logged now in the Avatax Log table, to record on what SAP document the calculation took place.

Fields are @ARGNS_ATX_LOG.U_SAPDoc and ARGNS_ATX_LOG.U_SAPDocStr

U_SAPDoc will have the SAP document object code, and U_SAPDocStr the SAP document object
description.