Add Material with Item Cat. T

Dear All,

I need to add a material component with Item Category* T (Text Item)* in project. When I am putting material Code and Item Category as T, I am getting "Do not enter material for Item Category T (Message No. CO134)".

Please, let me know how I can add material for T Item Category since we are doing some ABAP devlpment for same??

Thanks and Regards,

Atul R. Rajmane