 
IF OBJECT_ID ('FK_EST_PED_VD_PAG_CONVENIO_EST_PED_VD_PAG') IS NULL 
BEGIN 
	ALTER TABLE EST_PED_VD_PAG_CONVENIO ADD CONSTRAINT FK_EST_PED_VD_PAG_CONVENIO_EST_PED_VD_PAG FOREIGN KEY (PAG_CD_CTR) REFERENCES  EST_PED_VD_PAG (CD_CTR)
END