Index: src/attach.c
==================================================================
--- src/attach.c
+++ src/attach.c
@@ -91,14 +91,10 @@
     zErrDyn = sqlite3MPrintf(db, "too many attached databases - max %d", 
       db->aLimit[SQLITE_LIMIT_ATTACHED]
     );
     goto attach_error;
   }
-  if( !db->autoCommit ){
-    zErrDyn = sqlite3MPrintf(db, "cannot ATTACH database within transaction");
-    goto attach_error;
-  }
   for(i=0; i<db->nDb; i++){
     char *z = db->aDb[i].zDbSName;
     assert( z && zName );
     if( sqlite3StrICmp(z, zName)==0 ){
       zErrDyn = sqlite3MPrintf(db, "database %s is already in use", zName);
@@ -286,15 +282,10 @@
   }
   if( i<2 ){
     sqlite3_snprintf(sizeof(zErr),zErr, "cannot detach database %s", zName);
     goto detach_error;
   }
-  if( !db->autoCommit ){
-    sqlite3_snprintf(sizeof(zErr), zErr,
-                     "cannot DETACH database within transaction");
-    goto detach_error;
-  }
   if( sqlite3BtreeIsInReadTrans(pDb->pBt) || sqlite3BtreeIsInBackup(pDb->pBt) ){
     sqlite3_snprintf(sizeof(zErr),zErr, "database %s is locked", zName);
     goto detach_error;
   }
 

Index: test/attach2.test
==================================================================
--- test/attach2.test
+++ test/attach2.test
@@ -372,26 +372,21 @@
   }
 } {}
 do_test attach2-6.2 {
   catchsql {
     ATTACH 'test3.db' as aux2;
+    DETACH aux2;
   }
-} {1 {cannot ATTACH database within transaction}}
+} {0 {}}
 
 # EVIDENCE-OF: R-59740-55581 This statement will fail if SQLite is in
 # the middle of a transaction.
 #
 do_test attach2-6.3 {
   catchsql {
     DETACH aux;
   }
-} {1 {cannot DETACH database within transaction}}
-do_test attach2-6.4 {
-  execsql {
-    COMMIT;
-    DETACH aux;
-  }
-} {}
+} {0 {}}
 
 db close
 
 finish_test

Index: test/savepoint.test
==================================================================
--- test/savepoint.test
+++ test/savepoint.test
@@ -613,27 +613,32 @@
 # savepoints and ATTACH statements.
 # 
 
 # First make sure it is not possible to attach or detach a database while
 # a savepoint is open (it is not possible if any transaction is open).
+#
+# UPDATE 2017-07-26:  It is not possible to ATTACH and DETACH within a
+# a transaction.
 #
 do_test savepoint-10.1.1 {
   catchsql {
     SAVEPOINT one;
     ATTACH 'test2.db' AS aux;
+    DETACH aux;
   }
-} {1 {cannot ATTACH database within transaction}}
+} {0 {}}
 do_test savepoint-10.1.2 {
   execsql {
     RELEASE one;
     ATTACH 'test2.db' AS aux;
   }
   catchsql {
     SAVEPOINT one;
     DETACH aux;
+    ATTACH 'test2.db' AS aux;
   }
-} {1 {cannot DETACH database within transaction}}
+} {0 {}}
 do_test savepoint-10.1.3 {
   execsql {
     RELEASE one;
     DETACH aux;
   }