Tim asked:

I want to only provide the first item of each list in this SELECT:

You can use Python "slice" syntax, where the first item of a sequence (index position 0), is indicated like: listname[0] try: <dtml-in valid_prj> <dtml-call "REQUEST.set('val_prj_seq_item', _['sequence-item'][0])"> <OPTION value="&dtml-val_prj_seq_item;"><dtml-var "val_prj_seq_item"></OPTION> </dtml-in>