Hi,
Put the code like that way. And remember the name 'zmara' container element is case sensitive. Workflow must have container element naem zmara not ZMARA.
loop at wa_mara into work_ipcont.
w_ipcont-element = 'zmara'.
w_ipcont-value = work_ipcont . " here some value goes to that simple container
APPEND work_ipcont TO it_cont.
endloop.