Index: trunk/ppSub/src/ppSubCamera.c
===================================================================
--- trunk/ppSub/src/ppSubCamera.c	(revision 27660)
+++ trunk/ppSub/src/ppSubCamera.c	(revision 27661)
@@ -101,4 +101,5 @@
                                  pmFPAfile *bind,    // File to which to bind, or NULL
                                  char *filerule,     // Name of file rule
+                                 const char *argname,   // Argument name for file
                                  pmFPAfileType fileType // Type of file
     )
@@ -108,4 +109,9 @@
     // look for the file on the RUN metadata
     pmFPAfile *file = pmFPAfileDefineFromRun(&status, NULL, config, filerule); // File to return
+    if (!status) {
+        psError(psErrorCodeLast(), false, "Failed to load file definition for %s", filerule);
+        return NULL;
+    }
+    file = pmFPAfileBindFromArgs(&status, bind, config, filerule, argname);
     if (!status) {
         psError(psErrorCodeLast(), false, "Failed to load file definition for %s", filerule);
@@ -337,5 +343,6 @@
 
     // Output subtraction kernel
-    pmFPAfile *kernel = defineCalcFile(config, output, "PPSUB.OUTPUT.KERNELS", PM_FPA_FILE_SUBKERNEL);
+    pmFPAfile *kernel = defineCalcFile(config, output, "PPSUB.OUTPUT.KERNELS", "KERNEL",
+                                       PM_FPA_FILE_SUBKERNEL);
     if (!kernel) {
         psError(PS_ERR_UNEXPECTED_NULL, false, "Unable to define file PPSUB.OUTPUT.KERNELS");