I have created a relationship class in arc catalog using the same arguments I'm using below, however if I try and create it using the script below I get:

arcgisscripting.ExecuteError: ERROR 000622: Failed to execute (Create Relationship Class). Parameters are not valid. ERROR 000628: Cannot set input into parameter attributed.

Following is the script I'm using:

import arcpy
from arcpy import env

env.workspace = "C:\a.gdb"

origin_table = "a.gdb\Trail_meta"
destination_table = "a.gdb\trails_mfg"
out_relationship_class = "a.gdb\t3meta"
relationship_type = "SIMPLE"
forward_label = "Attributes from meta"
backward_label = "Attributes from trail"
message_direction = "NONE"
cardinality = "ONE_TO_MANY"
attributed = "NONE"
origin_primary_key = "OBJECTID"
origin_foreign_key = "TRAIL_NAME"

  • 2
    At a quick glance, since you're setting your environment variable env.workspace, I think you may be misleading the script by re-stating the name of the database in your variables origin_table,destination_table, and relationship_type. Try removing "a.gdb\" from these strings and see what happens. Mar 6, 2012 at 21:05
  • Added an answer below based on the comment above. Mar 6, 2012 at 21:34
  • yeah, tried that. Didn't help (I only put that in because of this sample code) help.arcgis.com/en/arcgisdesktop/10.0/help/index.html#//…
    – user3661
    Mar 6, 2012 at 21:39
  • 2
    When I see env.workspace = "C:\a.gdb" my first thought is "shouldn't that be one of the following:" env.workspace = "C:\\a.gdb", env.workspace = "C:/a.gdb" or env.workspace = r"C:\a.gdb"
    – PolyGeo
    Mar 8, 2012 at 6:33
  • 2
    Yep, backslash is an escape character in Python. Gotta look out for that especially on Windows where your filesystem paths almost always contain backslashes.
    – blah238
    May 6, 2012 at 0:10

2 Answers 2


Since you're setting your environment variable env.workspace, I think you may be misleading the tool by re-stating the name of the database in your variables: origin_table,destination_table, and relationship_type.

What the tool sees this:

origin_table = "a.gdb\a.gdb\Trail_meta"
destination_table = "a.gdb\a.gdb\trails_mfg"
out_relationship_class = "a.gdb\a.gdb\t3meta"

Redefine your variables to this:

origin_table = "Trail_meta"
destination_table = "trails_mfg"
out_relationship_class = "t3meta"

Also, it looks like all you want to import is the env module from arcpy, you can do that by simply using the from arcpy import env command instead of importing the entire arcpy module first. This may save you a bit of time when running the script.


Thanks this post actually helped me get this working. Sorry this is probably long since too late.

I believe the problem in the original post is that the relationship_type parameter is missing in the function call, thus causing an invalid parameter to be associated with the "attributed" parameter. Just change the function call to the following:


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