IF NOT EXISTS (SELECT 1 FROM SYSCOLUMNS WHERE ID = OBJECT_ID('PG_CRED_PG_CRED_IMP_RETIDO') AND name = 'CD_IMPOSTO')
BEGIN
ALTER TABLE dbo.PG_CRED_PG_CRED_IMP_RETIDO ADD
	CD_IMPOSTO int NOT NULL CONSTRAINT DF_PG_CRED_PG_CRED_IMP_RETIDO_CD_IMPOSTO DEFAULT (0)
	
END
