Added consumercode not null condition

business-services/billing-service/src/main/resources/db/migration/main/V20221206104420__egbs_bill_alter_add_consumercode.sql

@@ -1,6 +1,6 @@
 ALTER TABLE egbs_bill_v1 ADD COLUMN IF NOT EXISTS consumercode CHARACTER VARYING(256);
 
-UPDATE egbs_bill_v1 b SET consumerCode = bd.consumercode FROM egbs_billdetail_v1 bd WHERE bd.billid = b.id;
+UPDATE egbs_bill_v1 b SET consumerCode = bd.consumercode FROM egbs_billdetail_v1 bd WHERE bd.billid = b.id and b.consumercode is null;
 
 ALTER TABLE egbs_bill_v1 ALTER COLUMN consumercode SET NOT NULL;