diff --git a/scripts/errors/coll/LocalConcurrency.py b/scripts/errors/coll/LocalConcurrency.py
new file mode 100644
index 0000000000000000000000000000000000000000..c3209915aab698c3f4611c287d42b414354c5161
--- /dev/null
+++ b/scripts/errors/coll/LocalConcurrency.py
@@ -0,0 +1,37 @@
+#! /usr/bin/python3
+
+from scripts.Infrastructure.ErrorGenerator import ErrorGenerator
+from scripts.Infrastructure.Instruction import Instruction
+from scripts.Infrastructure.MPICallFactory import MPICallFactory, CorrectMPICallFactory
+from scripts.Infrastructure.CorrectParameter import CorrectParameterFactory, get_matching_recv
+from scripts.Infrastructure.Template import TemplateManager
+from scripts.Infrastructure.TemplateFactory import get_collective_template
+
+class InvalidRankErrorColl(ErrorGenerator):
+    nbfunc_to_use = ["mpi_ibarrier", "mpi_iallreduce", "mpi_ialltoall", "mpi_ibcast", "mpi_ireduce", "mpi_iscatter", "mpi_igather", "mpi_iscan" ]
+   
+    def __init__(self):
+        pass
+
+
+    def get_feature(self):
+        return ["COLL"]
+
+
+    def generate(self, generate_full_set):
+
+        for func_to_use in self.nbfunc_to_use:
+            tm = get_collective_template(func_to_use)
+
+            tm.set_description("LocalConcurrency-"+func_to_use, "Usage of buffer before operation is completed")
+
+            conflicting_inst = Instruction("buf[2]=1;")
+            conflicting_inst.set_has_error()
+            wait = tm.get_instruction("WAIT", return_list=True)
+            tm.insert_instruction(conflicting_inst,before_instruction=wait)
+
+
+            yield tm
+
+            if not generate_full_set:
+                return
\ No newline at end of file
diff --git a/scripts/errors/coll/ParamMatching.py b/scripts/errors/coll/ParamMatching.py
index 27c448807cdd4b271de4c8e73e8a5790a25284ef..6bfb81352a638dea46b09055f2d5ace025388352 100644
--- a/scripts/errors/coll/ParamMatching.py
+++ b/scripts/errors/coll/ParamMatching.py
@@ -86,7 +86,6 @@ class InvalidComErrorColl(ErrorGenerator):
 
             yield tm
 
-        # only check for one comm
         if not generate_full_set:
             return