diff --git a/soap/swad_web_service.h b/soap/swad_web_service.h
index b089bd95..1eaf6ae3 100644
--- a/soap/swad_web_service.h
+++ b/soap/swad_web_service.h
@@ -494,7 +494,7 @@ int swad__loginByUserPasswordKey (char *userID,char *userPassword,char *appKey,
                                   struct swad__loginByUserPasswordKeyOutput *loginByUserPasswordKeyOut);
 int swad__loginBySessionKey (char *sessionID,char *appKey,
                              struct swad__loginBySessionKeyOutput *loginBySessionKeyOut);
-int swad__getAvailableRoles (char *wsKey,
+int swad__getAvailableRoles (char *wsKey,int courseCode,
                              struct swad__getAvailableRolesOutput *getAvailableRolesOut);
 int swad__getNewPassword (char *userID,char *appKey,
                           struct swad__getNewPasswordOutput *getNewPasswordOut);
diff --git a/swad_API.c b/swad_API.c
index d4b65a6b..00232bae 100644
--- a/swad_API.c
+++ b/swad_API.c
@@ -1187,7 +1187,7 @@ With this function, SWADroid is able to check if user can see the button to show
 */
 
 int swad__getAvailableRoles (struct soap *soap,
-                             char *wsKey,							// input
+                             char *wsKey,int courseCode,					// input
                              struct swad__getAvailableRolesOutput *getAvailableRolesOut)	// output
   {
    int ReturnCode;
@@ -1195,6 +1195,7 @@ int swad__getAvailableRoles (struct soap *soap,
    /***** Initializations *****/
    API_Set_gSOAP_RuntimeEnv (soap);
    Gbl.WebService.Function = API_getAvailableRoles;
+   Gbl.Hierarchy.Crs.CrsCod = (long) courseCode;
 
    /***** Default value returned on error *****/
    getAvailableRolesOut->roles = 0;	// error
@@ -1216,8 +1217,28 @@ int swad__getAvailableRoles (struct soap *soap,
    Gbl.Usrs.Me.Role.Logged = Gbl.Usrs.Me.UsrDat.Roles.InCurrentCrs.Role;
 
    /***** Return available roles *****/
+   DB_QueryINSERT ("can not debug",
+		   "INSERT INTO debug"
+		   " (DebugTime,Txt)"
+		   " VALUES"
+		   " (NOW(),'Gbl.Usrs.Me.Role.Available before Rol_SetMyRoles: %u')",
+		   Gbl.Usrs.Me.Role.Available);
+
    Rol_SetMyRoles ();
    getAvailableRolesOut->roles = Gbl.Usrs.Me.Role.Available;
+   DB_QueryINSERT ("can not debug",
+		   "INSERT INTO debug"
+		   " (DebugTime,Txt)"
+		   " VALUES"
+		   " (NOW(),'Gbl.Usrs.Me.Role.Available after Rol_SetMyRoles: %u')",
+		   Gbl.Usrs.Me.Role.Available);
+
+   DB_QueryINSERT ("can not debug",
+		   "INSERT INTO debug"
+		   " (DebugTime,Txt)"
+		   " VALUES"
+		   " (NOW(),'getAvailableRolesOut->roles: %d')",
+		   getAvailableRolesOut->roles);
 
    return SOAP_OK;
   }
@@ -5294,19 +5315,6 @@ int swad__getMatchStatus (struct soap *soap,
          break;
      }
 
-   DB_QueryINSERT ("can not debug",
-		   "INSERT INTO debug"
-		   " (DebugTime,Txt)"
-		   " VALUES"
-		   " (NOW(),'getMatchStatusOut->matchCode: %d;"
-		   " getMatchStatusOut->questionIndex: %d;"
-		   " getMatchStatusOut->numAnswers: %d;"
-		   " getMatchStatusOut->answerIndex: %d')",
-		   getMatchStatusOut->matchCode,
-		   getMatchStatusOut->questionIndex,
-		   getMatchStatusOut->numAnswers,
-		   getMatchStatusOut->answerIndex);
-
    return SOAP_OK;
   }
 
@@ -6076,7 +6084,9 @@ int swad__getLocation (struct soap *soap,
 				    " AND rooms.BldCod=buildings.BldCod"
 				    " AND buildings.CtrCod=centres.CtrCod"
 				    " AND centres.InsCod=institutions.InsCod"
-				    " ORDER BY rooms.Capacity DESC LIMIT 1",	// Get the biggest room
+				    " ORDER BY rooms.Capacity,"	// Get the biggest room
+				              "rooms.ShortName"
+				              " DESC LIMIT 1",
 			     MACnum);
 
    API_GetDataOfLocation (soap,
diff --git a/swad_action.c b/swad_action.c
index 07853905..92909c68 100644
--- a/swad_action.c
+++ b/swad_action.c
@@ -1834,7 +1834,7 @@ Act_Action_t Act_FromActCodToAction[1 + Act_MAX_ACTION_COD] =	// Do not reuse un
 	-1,			// #19 (obsolete action)
 	ActSeeSylPra,		// #20
 	-1,			// #21 (obsolete action)
-	ActDoActOnSevTch,	// #22
+	ActSeeRecSevTch,	// #22
 	ActAdmBrf,		// #23
 	-1,			// #24 (obsolete action)
 	ActSeeCrsTT,		// #25
diff --git a/swad_changelog.h b/swad_changelog.h
index 492b402a..03d37567 100644
--- a/swad_changelog.h
+++ b/swad_changelog.h
@@ -555,7 +555,7 @@ enscript -2 --landscape --color --file-align=2 --highlight --line-numbers -o - *
 En OpenSWAD:
 ps2pdf source.ps destination.pdf
 */
-#define Log_PLATFORM_VERSION	"SWAD 19.263.1 (2020-09-02)"
+#define Log_PLATFORM_VERSION	"SWAD 20.0 (2020-09-22)"
 #define CSS_FILE		"swad19.253.css"
 #define JS_FILE			"swad19.254.js"
 /*
@@ -573,6 +573,8 @@ TODO: Que al generar un examen s
 TODO: Create module swad_test_result
 "sudo apt install webp" en Ubuntu, y "yum install libwebp libwebp-tools" en CentOS, para decodificar imágenes Web/ug reportado por Javier Fernández Baldomero.
 
+	Version 20.0:	  Sep 22, 2020  Changes in API function getAvailableRoles.
+					Fixed bug when listing teachers' records. (304400 lines)
 	Version 19.263.1: Sep 02, 2020  MAC address in form to create a new room. (304389 lines)
 	Version 19.263:   Sep 02, 2020  New module swad_MAC for MAC addresses. (304364 lines)
 	Version 19.262:   Sep 01, 2020  Edition of MAC addresses in listing of rooms. (304239 lines)