Index: /issm/trunk-jpl/src/m/classes/inversion.py
===================================================================
--- /issm/trunk-jpl/src/m/classes/inversion.py	(revision 26479)
+++ /issm/trunk-jpl/src/m/classes/inversion.py	(revision 26480)
@@ -138,6 +138,6 @@
         # Only SSA, HO and FS are supported right now
         if solution == 'StressbalanceSolution':
-            if not (md.flowequation.isSSA or md.flowequation.isHO or md.flowequation.isFS or md.flowequation.isL1L2):
-                md.checkmessage("'inversion can only be performed for SSA, HO or FS ice flow models")
+            if not (md.flowequation.isSSA or md.flowequation.isMLHO or md.flowequation.isHO or md.flowequation.isFS or md.flowequation.isL1L2):
+                md.checkmessage("'inversion can only be performed for SSA, MLHO, HO or FS ice flow models")
         if solution == 'BalancethicknessSolution':
             md = checkfield(md, 'fieldname', 'inversion.thickness_obs', 'size', [md.mesh.numberofvertices], 'NaN', 1, 'Inf', 1)