diff -r dc457177dbc1 -r dc283bc7e033 mercurial/localrepo.py
--- a/mercurial/localrepo.py	Tue Jul 21 13:58:58 2020 +0530
+++ b/mercurial/localrepo.py	Tue Jul 21 18:21:27 2020 +0530
@@ -3334,6 +3334,14 @@
             )
             dropped.add(bookmarks.BOOKMARKS_IN_STORE_REQUIREMENT)
 
+        if b'shared' in requirements or b'relshared' in requirements:
+            raise error.Abort(
+                _(
+                    b"cannot create shared repository as source was created"
+                    b" with 'format.usestore' config disabled"
+                )
+            )
+
     return dropped