Triggers Compilation Error

Tried this code but still getting compilation errors

CREATE OR REPLACE TRIGGER SET_OH_FLAG BEFORE INSERT ON INDEX_FUND_XREF FOR EACH ROW
WHEN (new.FUND LIKE '62100%')
BEGIN
:new.OH_FLAG=1;
END; Other considerations:

1. I own this table
2. The FUND is a char datatype
3. the OH_FLAG is a number with a size of 1 and precision of 0