do_sql.bat:
 -----------------------------------
 
c:\progra~ 1 \Firebird\Bin\isql <base> -u SYSDBA -p % 2  -i % 1 

update018.sql:
 -----------------------------------
 
create generator accountsID;
set generator accountsID to  0 ;
create table accounts (
id         int default  0  not null primary key,
num        char( 14 ) default '' not null,
name       char( 50 ) default '' not null);
insert into accounts (id, num, name) 
              values ( gen_id(accountsID, 1 ), '000000000000', 'введите транзитный счет');

alter table receiv add
    trans_acc int default  1  references accounts;
update receiv set trans_acc= 1 ;

alter table document add
    trans_acc char( 14 ) default '' not null;
alter table a_document add
    trans_acc char( 14 ) default '' not null;

DECLARE EXTERNAL FUNCTION abs 
    DOUBLE PRECISION
    RETURNS DOUBLE PRECISION BY VALUE
    ENTRY_POINT 'IB_UDF_abs' MODULE_NAME 'ib_udf';

update document set trans_acc=(select trans_acc from params);    
update a_document set trans_acc=(select trans_acc from params);    
update params set ver='0.18';
commit;

alter table receiv add
    trans_acc int default  1  references accounts;

set transaction;
... 
commit;

gfix <base> -shut -force  5 
...
gfix <base> -online