GetDynamicProperty() from IEC104 variables.

GetDynamicProperty() from IEC104 variables.

Hi all!
I am programming the Addin (C#) inside the Energy Edition Version 11 Build126436 64Bit and Microsoft Visual Studio Professional 2019 Version 16.11.26
I want to get the COA, IOA, and Type of variables coming from the IEC104 driver in the runtime.
For the IEC850 variables I use, for instance:
      vble.GetDynamicProperty("SymbAddr");
Or other data, and it works fine.
When I look for COA, IOA, and Type in the manual: "... / Programming Interfaces / Object Model / Addin / Variable / IVariable / IVariable DynProperties / CIEC870VarED", I find the properties "IEC870_COA1", "IEC870_IOA1" and "IEC870_TYPE".
So I use:
      vble.GetDynamicProperty("IEC870_COA1");
But GetDynamicProperty launches an exception and says: "Given property doesn't exist...test::IEC870_COA1" (test is my variable).
It is the same for IEC870_IOA1 and IEC870_TYPE.
What I am doing wrong?

Best regards,

Germán Marcos