diff --git a/python/obitools3/obidms/_obidms.pxd b/python/obitools3/obidms/_obidms.pxd
index 908c9e3..ce3fef9 100644
--- a/python/obitools3/obidms/_obidms.pxd
+++ b/python/obitools3/obidms/_obidms.pxd
@@ -57,6 +57,8 @@ cdef class OBIView:
                      index_t nb_elements_per_line=*,
                      list elements_names=*,
                      str indexer_name=*,
+                     str associated_column_name=*,
+                     obiversion_t associated_column_version=*,
                      str comments=*,
                      bint create=*
                     )
diff --git a/python/obitools3/obidms/_obidms.pyx b/python/obitools3/obidms/_obidms.pyx
index 2b516e7..f5b22d1 100644
--- a/python/obitools3/obidms/_obidms.pyx
+++ b/python/obitools3/obidms/_obidms.pyx
@@ -339,6 +339,8 @@ cdef class OBIView :
                      index_t nb_elements_per_line=1,
                      list elements_names=None,
                      str indexer_name="",
+                     str associated_column_name="",
+                     obiversion_t associated_column_version=-1,
                      str comments="",
                      bint create=True
                      ) :
@@ -376,6 +378,7 @@ cdef class OBIView :
         if (obi_view_add_column(self.pointer, column_name_b, version_number,     # TODO should return pointer on column?
                                 data_type, nb_lines, nb_elements_per_line, 
                                 elements_names_b, str2bytes(indexer_name), 
+                                str2bytes(associated_column_name), associated_column_version,
                                 str2bytes(comments), create) < 0) :
             raise Exception("Problem adding a column in a view")
         
diff --git a/python/obitools3/obidms/capi/obidmscolumn.pxd b/python/obitools3/obidms/capi/obidmscolumn.pxd
index 84694c8..b23b85f 100644
--- a/python/obitools3/obidms/capi/obidmscolumn.pxd
+++ b/python/obitools3/obidms/capi/obidmscolumn.pxd
@@ -16,21 +16,28 @@ from libc.stdint cimport uint8_t
 
 cdef extern from "obidmscolumn.h" nogil:
     
+    struct Column_reference_t :
+        const_char_p  column_name
+        obiversion_t  version
+    
+    ctypedef Column_reference_t* Column_reference_p
+
     struct OBIDMS_column_header_t:
-        size_t          header_size
-        size_t          data_size
-        index_t         line_count
-        index_t         lines_used
-        index_t         nb_elements_per_line
-        const_char_p    elements_names
-        OBIType_t       returned_data_type
-        OBIType_t       stored_data_type
-        time_t          creation_date
-        obiversion_t    version
-        obiversion_t    cloned_from
-        const_char_p    name
-        const_char_p    indexer_name
-        const_char_p    comments
+        size_t              header_size
+        size_t              data_size
+        index_t             line_count
+        index_t             lines_used
+        index_t             nb_elements_per_line
+        const_char_p        elements_names
+        OBIType_t           returned_data_type
+        OBIType_t           stored_data_type
+        time_t              creation_date
+        obiversion_t        version
+        obiversion_t        cloned_from
+        const_char_p        name
+        const_char_p        indexer_name
+        Column_reference_t  associated_column
+        const_char_p        comments
     
     ctypedef OBIDMS_column_header_t* OBIDMS_column_header_p
 
@@ -48,6 +55,8 @@ cdef extern from "obidmscolumn.h" nogil:
                                       index_t nb_elements_per_line, 
                                       const_char_p elements_names,
                                       const_char_p indexer_name,
+                                      const_char_p associated_colum_name,
+                                      obiversion_t associated_colum_version,
                                       const_char_p comments)
                 
     OBIDMS_column_p obi_open_column(OBIDMS_p dms, 
diff --git a/python/obitools3/obidms/capi/obiview.pxd b/python/obitools3/obidms/capi/obiview.pxd
index 50cc56a..b64b756 100644
--- a/python/obitools3/obidms/capi/obiview.pxd
+++ b/python/obitools3/obidms/capi/obiview.pxd
@@ -10,7 +10,9 @@ from .obitypes           cimport const_char_p, \
                                  index_t, \
                                  time_t
 from ..capi.obidms       cimport OBIDMS_p
-from ..capi.obidmscolumn cimport OBIDMS_column_p
+from ..capi.obidmscolumn cimport OBIDMS_column_p, \
+                                 Column_reference_t, \
+                                 Column_reference_p
 
 from libc.stdint cimport uint8_t
 
@@ -24,13 +26,6 @@ cdef extern from "obiview.h" nogil:
     extern const_char_p QUALITY_COLUMN
 
 
-    struct Column_reference_t :
-        const_char_p  column_name
-        obiversion_t  version
-    
-    ctypedef Column_reference_t* Column_reference_p
-
-
     struct Obiview_infos_t :
         time_t              creation_date
         const_char_p        name
@@ -79,6 +74,8 @@ cdef extern from "obiview.h" nogil:
                             index_t nb_elements_per_line,
                             const_char_p elements_names,
                             const_char_p indexer_name,
+                            const_char_p associated_column_name,
+                            obiversion_t associated_column_version,
                             const_char_p comments,
                             bint create)