diff --git a/aern2-mp.cabal b/aern2-mp.cabal
--- a/aern2-mp.cabal
+++ b/aern2-mp.cabal
@@ -4,10 +4,10 @@
 --
 -- see: https://github.com/sol/hpack
 --
--- hash: db2ad6fe0e6460591de35bce8f443dcc33712ff74369d8be93d12371b3ccd0b7
+-- hash: 3a6ca9d8026d093f51e3a0bb5c6a09c0a4cb008c15b8d398d4fc46d44591a13a
 
 name:           aern2-mp
-version:        0.2.2.0
+version:        0.2.3.0
 synopsis:       Multi-precision ball (interval) arithmetic
 description:    Please see the README on GitHub at <https://github.com/michalkonecny/aern2/#readme>
 category:       Math
diff --git a/changelog.md b/changelog.md
--- a/changelog.md
+++ b/changelog.md
@@ -1,5 +1,7 @@
 # Change log for aern2-mp
 
+* v 0.2.3 2021-05-22
+  * make MPBall "Very inaccurate" a *potential* error (important for CReal accuracy queries)
 * v 0.2.2 2021-05-21
   * move Kleenean from mixed-types-num to here
 * v 0.2.1 2021-05-18
diff --git a/src/AERN2/MP/Ball/Type.hs b/src/AERN2/MP/Ball/Type.hs
--- a/src/AERN2/MP/Ball/Type.hs
+++ b/src/AERN2/MP/Ball/Type.hs
@@ -141,7 +141,7 @@
   giveUpIfVeryInaccurate = (aux =<<)
     where
     aux b@(MPBall _ e)
-      | e > 1000 = CN.noValueNumErrorCertain $ numErrorVeryInaccurate "MPBall" ""
+      | e > 1000 = CN.noValueNumErrorPotential $ numErrorVeryInaccurate "MPBall" ""
       | otherwise = cn b
 
 instance CanTestContains MPBall MPBall where