TagSystemFolder tagSystemFolder = HMIGenerator.hmiTarget.TagFolder;

var tagFolderName = tagSystemFolder.Name;

var tagUserFolder = tagSystemFolder.Folders.FirstOrDefault(x => x.Name == "PLC_Tags");

tagUserFolder = tagUserFolder.Folders.FirstOrDefault(x => x.Name == "AHU_1");

var tagTableComposition = tagUserFolder.TagTables;

FileInfo fileInfo = new FileInfo(@"c:\Temp\Tag table_UDT_WithDefaults.xml");

/*

//EXPORT !

//(TiaPortal.Projects[0].Devices[3].GetService<SoftwareContainer>().Software as HmiTarget).TagFolder.Folders[1].TagTables[4]

TagTable tagTable = tagTableComposition.Find("Tag table_UDT");

if (fileInfo.Exists)

{

fileInfo.Delete();

}

tagTable.Export(fileInfo, ExportOptions.None);

tagTable.Delete();

*/

//IMPORT !

var iListTagTable = tagTableComposition.Import(fileInfo, ImportOptions.Override);

 As you can see, I first exported an HMI tag table (commented code), and then try to Import the same tag table.

The problem occurs because the corresponding PLC tag type is a user-defined type, not a basic type likeINT,BOOL, etc.

I found those links:
Importing/exporting data of an HMI device

Special considerations for the export/import of an external HMI tag with integrated connection

Importing and exporting tags (Basic Panels, Panels, Comfort Panels, RT Advanced, RT Professional)

but I could not find solution.

This is part of my xml HMI tag table:

I tried already:

1. <Name>SndRcv_AHU_1.AnalogSensors.Exhaust_Air_Humidity_BTH04</Name>
2. <Name>"SndRcv_AHU_1".AnalogSensors.Exhaust_Air_Humidity_BTH04</Name>
   
3. <Name>MeasureDT</Name> for HMI and PLC tag type
   
4. <Name>MeasureDT V 0.0.3</Name> for HMI and PLC tag type
   

Has anyone solved this problem so far?