Check for pre-existing OTT ID before checking for homonym.

otc/taxonomy/patching.cpp

@@ -290,7 +290,16 @@ bool_str_t PatchableTaxonomy::add_new_taxon(OttId oid,
     auto & tree = this->get_mutable_tax_tree();
     auto & rt_data = tree.get_data();
 
-    // 1. Check if the new taxon is a homonym of an existing taxon.
+    // 1. Check if the OTT ID is already used.
+    auto itnit = included_taxon_from_id(oid);
+    auto itrit = rt_data.id_to_record.find(oid);
+    if (itnit != nullptr || itrit != rt_data.id_to_record.end()) {
+        std::string expl = "OTT ID " + std::to_string(oid);
+        expl += " is already used.";
+        return bool_str_t{false, expl};
+    }
+
+    // 2. Check if the new taxon is a homonym of an existing taxon.
     auto nm_nd_it = rt_data.name_to_node.find(name);
     if (nm_nd_it == rt_data.name_to_node.end()) {
         if (homonym_of != nullptr) {
@@ -302,15 +311,6 @@ bool_str_t PatchableTaxonomy::add_new_taxon(OttId oid,
         return bool_str_t{false, expl};
     }
 
-    // 2. Check if the OTT ID is already used.
-    auto itnit = included_taxon_from_id(oid);
-    auto itrit = rt_data.id_to_record.find(oid);
-    if (itnit != nullptr || itrit != rt_data.id_to_record.end()) {
-        std::string expl = "OTT ID " + std::to_string(oid);
-        expl += " is already used.";
-        return bool_str_t{false, expl};
-    }
-
     // 3. Find the parent taxon by its OTT ID.
     RTRichTaxNode * par_ptr = const_cast<RTRichTaxNode *>(included_taxon_from_id(parent_id));
     if (par_ptr == nullptr) {