Thanks Kerry , that did solve the problem.
Yeah , I search the help for the add_list method but honestly the document is very poor of enough descriptions for each function ( method ).
Life seems easy with OpenDCL to me for now , although I wanted to learn this tool from a quite two or three years ago , but it was complicated to me in that time and I don't know why.
Anyway , I do appreciate your time and inputs Kerry.
Regards.