Index: trunk/psModules/src/imcombine/pmSubtraction.c
===================================================================
--- trunk/psModules/src/imcombine/pmSubtraction.c	(revision 21470)
+++ trunk/psModules/src/imcombine/pmSubtraction.c	(revision 23740)
@@ -1385,4 +1385,19 @@
     }
 
+    // Data exists on the outputs now
+    if (out1) {
+        out1->data_exists = true;
+        if (out1->parent) {
+            out1->parent->data_exists = out1->parent->parent->data_exists = true;
+        }
+    }
+    if (out2) {
+        out2->data_exists = true;
+        if (out2->parent) {
+            out2->parent->data_exists = out2->parent->parent->data_exists = true;
+        }
+    }
+
+
     psLogMsg("psModules.imcombine", PS_LOG_INFO, "Convolve image: %f sec",
              psTimerClear("pmSubtractionConvolve"));