Index: /tags/ipp-20170121/ippconfig/recipes/ppSub.config
===================================================================
--- /tags/ipp-20170121/ippconfig/recipes/ppSub.config	(revision 40187)
+++ /tags/ipp-20170121/ippconfig/recipes/ppSub.config	(revision 40188)
@@ -215,4 +215,11 @@
 END
 
+STACKSTACK_CONV1      METADATA
+        DUAL            BOOL    FALSE   # Dual convolution?
+        INVERSE         BOOL    FALSE   # Generate inverse subtraction?
+        PHOTOMETRY      BOOL    TRUE    # Perform photometry?
+        CONVOLVE.TARGET STR     SINGLE1 # convolution direction
+END
+
 # Difference of two stacks : uses SINGLE not DUAL convolution
 STACKPHOT	METADATA