Vect_open_old2 cannot recognize mapset='ogr'

[artegion]

while manual says:

Parameters
[out] Map pointer to Map_info structure
name name of vector map to open (datasource for direct OGR access)

mapset mapset name ("" for search path, "OGR" for direct OGR access)

layer layer name (OGR layer for direct OGR access)

calling Vect_open_old2 with
name='some_datasource', mapset='OGR', layer='some_layer_name'
does not work

It works only with
name='some_datasource@OGR',layer='some_layer_name'

[martinl]

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