diff -r 76175defb87b -r 1f2af384fb1f stage3/fill_candidate_datatypes.cc
--- a/stage3/fill_candidate_datatypes.cc	Sun May 08 20:01:15 2016 +0100
+++ b/stage3/fill_candidate_datatypes.cc	Wed May 11 18:41:45 2016 +0100
@@ -2170,7 +2170,7 @@
 void *fill_candidate_datatypes_c::visit(function_invocation_c *symbol) {
 	if      (NULL != symbol->formal_param_list)        symbol->   formal_param_list->accept(*this);
 	else if (NULL != symbol->nonformal_param_list)     symbol->nonformal_param_list->accept(*this);
-	else ERROR;
+	// else ERROR;  NOTE-> We support the non-standard feature of POUS with no in, out and inout parameters, so this is no longer an internal error!
 
 	generic_function_call_t fcall_param = {
 			  function_name:                symbol->function_name,