BIS-371 SP-569 fix the typo in schema

SVN: 28640

screening/source/sql/imaging/postgresql/023/schema-023.sql

@@ -126,7 +126,7 @@ CREATE TABLE CHANNELS (
     PRIMARY KEY (ID),
     CONSTRAINT FK_CHANNELS_1 FOREIGN KEY (DS_ID) REFERENCES IMAGE_DATA_SETS (ID) ON DELETE CASCADE ON UPDATE CASCADE,
     CONSTRAINT FK_CHANNELS_2 FOREIGN KEY (EXP_ID) REFERENCES EXPERIMENTS (ID) ON DELETE CASCADE ON UPDATE CASCADE,
-    CONSTRAINT CHANNELS _DS_EXP_ARC_CK CHECK ((DS_ID IS NOT NULL AND EXP_ID IS NULL) OR (DS_ID IS NULL AND EXP_ID IS NOT NULL)),
+    CONSTRAINT CHANNELS_DS_EXP_ARC_CK CHECK ((DS_ID IS NOT NULL AND EXP_ID IS NULL) OR (DS_ID IS NULL AND EXP_ID IS NOT NULL)),
     
     CONSTRAINT CHANNELS_UK_1 UNIQUE(CODE, DS_ID),
     CONSTRAINT CHANNELS_UK_2 UNIQUE(CODE, EXP_ID)