This is probably something very simple, but I don't have a lot of experience updating items with Weidu. Messing with basilisks' petrifying weapons, I want to put some more effects in their abilities and write:
COPY_EXISTING ~BASILG1.ITM~ ~override~
LPF ~ADD_ITEM_EFFECT~ INT_VAR opcode = 146 target = 2 timing = 1 probability1 = 100 probability2 = 0 duration = 0 parameter2 = 1 resist_dispel = 0 save = 4 savebonus = ~-4~ insert_point = ~1~ STR_VAR resource = ~PETALL_#~ END
LPF ~ADD_ITEM_EFFECT~ INT_VAR opcode = 146 target = 2 timing = 1 probability1 = 100 probability2 = 0 duration = 0 parameter2 = 1 resist_dispel = 0 save = 4 savebonus = ~-4~ insert_point = ~2~ STR_VAR resource = ~PETANI_#~ END
BUT_ONLY
No error, but no change.