Index: trunk/psModules/src/imcombine/pmSubtractionAnalysis.c
===================================================================
--- trunk/psModules/src/imcombine/pmSubtractionAnalysis.c	(revision 21422)
+++ trunk/psModules/src/imcombine/pmSubtractionAnalysis.c	(revision 23780)
@@ -201,6 +201,11 @@
         psFree(image);
 
-        psMetadataAddF32(analysis, PS_LIST_TAIL, PM_SUBTRACTION_ANALYSIS_DECONV_MAX,
-                         PS_META_DUPLICATE_OK, "Maximum deconvolution fraction", max);
+        psMetadataItem *item = psMetadataLookup(analysis, PM_SUBTRACTION_ANALYSIS_DECONV_MAX); // Previous
+        if (item) {
+            item->data.F32 = PS_MAX(item->data.F32, max);
+        } else {
+            psMetadataAddF32(analysis, PS_LIST_TAIL, PM_SUBTRACTION_ANALYSIS_DECONV_MAX, 0,
+                             "Maximum deconvolution fraction", max);
+        }
     }