Returns the handle of the temp-table in the original source ProDataSet object that corresponds to the temp-table currently associated with this temp-table handle.
The AVM uses this value to match up temp-tables in a MERGE-CHANGES operation.
Note: If you invoke the EMPTY-DATASET( ) or EMPTY-TEMP-TABLE( ) method on the original source ProDataSet or its corresponding temp-table, respectively, the ABL Virtual Machine (AVM) sets this attribute to the Unknown value (?).