in .opl file I have the following definitions:

tuple cpipe{
  string cpipe;
  {string} cou;
 };

 {cpipe} cc = ...;

in .dat file I have:

SheetConnection sheet("small.xlsx");
cc from SheetRead(sheet,"'Sheet1'!A2:D4");

I get the following error:

Data element "cc" of type {cpipe} not supported for sheets

Can anyone suggest a simple workaround please?