Create Simple Data Mapping Errors

BridgetBurgos — Tue, 04 Aug 2026 20:09:42 GMT

Hi,

Not sure if anyone out there can help with this but I've been having issues with the Create Simple Data Mapping tool. I have the latest version of the UDMS toolbox and ArcPro. None of my feature classes have been throwing errors as I've been cleaning them up, preparing them for UN migration. Nothing seems amiss with any pre-exsisting subtypes. I've tried closing any open maps. My data is in a re-created file gdb copied from an enterprise gdb. So maybe this has something to do with it? So the feature dataset is still titled, WaterDistribution.DBO.WaterDistribution in the metadata

I'm confused though because I have done this same workflow before and had no issues with this tool.
Any insight would be appreciated !

ArcGIS Pro 3.7.1.1901
udms 3.7.1
Executing from ArcGIS Pro, 1 map(s), activeMap = False
Loading Asset Types
Loading Source Layers
Processing 19 datasets
wFitting -> Has Feature Types (fittingtype)
wSystemValve -> Has subtypes (SYSVALVE_SUBTYPE)
wSystemValve -> No Feature Types Found
wNetworkStructure -> Has Feature Types (structtype)
Traceback (most recent call last):
File "C:\xy\MLTMUA Water Migration Working Folder\MLTMUA Water Migration Working Project\UtilityDataManagementSupport 3.7.atbx\CreateSimpleDataMapping.tool\tool.script.execute.py", line 19, in <module>
File "C:\xy\MLTMUA Water Migration Working Folder\MLTMUA Water Migration Working Project\UtilityDataManagementSupport 3.7.atbx\udms\esri.py", line 557, in wrapper
f = func(*args, **kwargs)
File "C:\xy\MLTMUA Water Migration Working Folder\MLTMUA Water Migration Working Project\UtilityDataManagementSupport 3.7.atbx\udms\logic\__init__.py", line 1153, in data_mappings
return sdm.main(existing_mapping)
~~~~~~~~^^^^^^^^^^^^^^^^^^
File "C:\xy\MLTMUA Water Migration Working Folder\MLTMUA Water Migration Working Project\UtilityDataManagementSupport 3.7.atbx\udms\sumt\DataMappings.py", line 599, in main
self.create_mapping_workbook(existing_mapping, None)
~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^
File "C:\xy\MLTMUA Water Migration Working Folder\MLTMUA Water Migration Working Project\UtilityDataManagementSupport 3.7.atbx\udms\sumt\DataMappings.py", line 509, in create_mapping_workbook
source_info = load_source_layers(self.source_gdb, self.source_types_df, self.get_count)
File "C:\xy\MLTMUA Water Migration Working Folder\MLTMUA Water Migration Working Project\UtilityDataManagementSupport 3.7.atbx\udms\sumt\sumt_common.py", line 239, in load_source_layers
subtype_info, domain_lookup = domain_code_lookup(class_desc)
~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^
File "C:\xy\MLTMUA Water Migration Working Folder\MLTMUA Water Migration Working Project\UtilityDataManagementSupport 3.7.atbx\udms\sumt\sumt_common.py", line 210, in domain_code_lookup
for subtype_code, subtype_info in arcpy.da.ListSubtypes(desc.catalogPath).items():
~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^
File "C:\Program Files\ArcGIS\Pro\Resources\ArcPy\arcpy\__init__.py", line 2969, in wrapped
result = obj(*args, **kwargs)
OSError: C:\xy\MLTMUA Water Migration Working Folder\MLTMUA Water Migration Working Project\260803WaterCopy.gdb\WaterDistribution\CIMFeatureDatasetDataConnection>

Failed script Create Simple Data Mapping...
Failed to execute (CreateSimpleDataMapping).

Re: Create Simple Data Mapping Errors

MikeMillerGIS — Tue, 04 Aug 2026 22:25:39 GMT

Do you have a featureclass that is the same name as your FeatureDataset? Any way you can package this up and send it to me?

Re: Create Simple Data Mapping Errors

MikeMillerGIS — Wed, 05 Aug 2026 13:42:25 GMT

Thanks for sharing a repo dataset. Something is corrupt in that database.

When I walk the input database to get it layers, it returns a very odd layer

Try this simple code snippet:

def describe_workspace_elements(workspace) -> list: """All describe children in the workspace""" if not hasattr(workspace, "dataType"): workspace = arcpy.Describe(workspace) children = [] for child in getattr(workspace, "children", []): children.append(child) children.extend(getattr(child, "children", [])) return children gdb = r"C:\\temp\\SimpleDataMappingError\\260803WaterCopy_1.gdb" [f.name for f in describe_workspace_elements(gdb)]

Re: Create Simple Data Mapping Errors

MikeMillerGIS — Wed, 05 Aug 2026 13:56:08 GMT

Appears to be the ControlValve class

bad_layer = [d for d in describe_workspace_elements(r"C:\\temp\\260803WaterCopy_1.gdb") if d.name == "CIMFeatureDatasetDataConnection>"][0]
print(bad_layer.aliasName)

Re: Create Simple Data Mapping Errors

MikeMillerGIS — Wed, 05 Aug 2026 13:59:02 GMT

I copied the class to a new FGDB, deleted the original, pasted it back and it fixed it.

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Create Simple Data Mapping Errors

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Re: Create Simple Data Mapping Errors