I did try that, but no matter which update I left in I still got the error.
FIND oe_line WHERE oe_line.order_no=oe_hdr.order_no
oe_line.complete='Y'
or
FIND oe_line WHERE oe_line.order_no=oe_hdr.order_no
oe_line.date_last_modified=CURRENT_TIMESTAMP
Still gave the error.
If I do just the FIND it works fine.