currently the function numbers need to be consecutive for the DKS version. This is now enforced.

src/classes/PFunctionHandler.cpp

@@ -116,6 +116,18 @@ Bool_t PFunctionHandler::DoParse()
     }
   }
 
+  // for DKS, functions must be numbered consecutive
+  if (success) {
+    for (UInt_t i=0; i<fFuncs.size(); i++) {
+      if (fFuncs[i].GetFuncNo() != i+1) {
+        std::cerr << std::endl << "**ERROR**: for DKS, the function numbers need to be consecutive, sorry.";
+        std::cerr << std::endl;
+        success = false;
+        break;
+      }
+    }
+  }
+
   return success;
 }