Submitted by: @pavel-zotov

set term ^;
create or alter procedure sp_ttt as begin end^
set term ;^

recreate table ttt(id int, x int);
commit;
set term ^;
create or alter procedure sp_ttt(is_deleting boolean) as
begin
end^
create or alter trigger ttt_biud for ttt
active before insert or update or delete position 0 as
begin
--execute procedure sp_ttt( deleting ); ------------------ this causes error during compilation:
--execute procedure sp_ttt( :deleting ); ------------------ this also causes error (note on COLON before "deleting" :))
execute procedure sp_ttt( iif(deleting, true, false) ); ----- this compiled OK; but this expression looks cumbersome because 'deleting' is already of BOOLEAN type
end^
set term ;^

/*
PS. Error text:
------------------
Column does not belong to referenced table.
unsuccessful metadata update.
unknown ISC error 336397272.
Dynamic SQL Error.
SQL error code = -206.
Column unknown.
DELETING.
*/