A user can rename or move a point or accumulator in Geo SCADA Expert after HCAL creates the Wonderware Historian tag for it. In this situation, the tag name will not match the Geo SCADA Expert database item's current name (unless you have used the RenameTag method to realign the two names).
To find a tag name in Geo SCADA Expert, view the Wonderware Historian Export status attribute in the Status display for the Geo SCADA Expert point or accumulator.
Further Information
Wonderware Historian Driver-Specific Status Display Attributes.