declare column_exists exception;
 pragma exception_init (column_exists , -01430);
 begin execute immediate 'ALTER TABLE BPE ADD (vBC20 VARCHAR2(15))';
exception when column_exists then null;
 end;
/
declare column_exists exception;
 pragma exception_init (column_exists , -01430);
 begin execute immediate 'ALTER TABLE BPE ADD (pICMS20 VARCHAR2(5))';
exception when column_exists then null;
 end;
/
declare column_exists exception;
 pragma exception_init (column_exists , -01430);
 begin execute immediate 'ALTER TABLE BPE ADD (vICMS20 VARCHAR2(15))';
exception when column_exists then null;
 end;
/
declare column_exists exception;
 pragma exception_init (column_exists , -01430);
 begin execute immediate 'ALTER TABLE BPE ADD (vBP VARCHAR2(15))';
exception when column_exists then null;
 end;
/
declare column_exists exception;
 pragma exception_init (column_exists , -01430);
 begin execute immediate 'ALTER TABLE BPE ADD (vDesconto VARCHAR2(15))';
exception when column_exists then null;
 end;