private ExternalLocation addMyExternal(ExternalLocation myExternalLocation, TaskMonitor monitor)
			throws CancelledException {

		ExternalLocation resultExternalLocation = null;
		try {
			// Add MY external giving it a new name if necessary.
			resultExternalLocation = addExternal(myExternalLocation, monitor);
		}
		catch (DuplicateNameException e) {
			MergeManager.showBlockingError("Error Merging External Location",
				"Couldn't merge external '" + myExternalLocation.getLabel() + "'. " +
					e.getMessage());
		}
		catch (InvalidInputException e) {
			MergeManager.showBlockingError("Error Merging External Location",
				"Couldn't merge external '" + myExternalLocation.getLabel() + "'. " +
					e.getMessage());
		}
		return resultExternalLocation;
	}
Gets the external locations (result, latest, my, original) for the specified MY program
external space address.<br>
NOTE: Be careful where you call this method from. It is intended to be used for external
location changes only (not for Adds). It gets the ORIGINAL based on MY and then LATEST and
RESULT based on the ORIGINAL.
@param myAddress the MY program external space address for MY external location
@return all four program's external locations.
Ghidra/Features/Base/src/main/java/ghidra/app/merge/listing/ExternalFunctionMerger.java