Debugging RuntimeError: workspace already in transaction mode from arcpy.da.UpdateCur

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I am making my first attempt at editing an ArcSDE feature class with python through a da.UpdateCursor. I'm essentially taking code I've written for a file geodatabase feature class and applying it to an SDE feature class. Doing so produces an error, and I'm not sure how to rectify the problem.

I'm using ArcGIS 10.1 for Desktop.

Pertinent code:

Struxfeature = r"DatabaseConnections\PipelinePathways.sde\PPGIS.Strux\PPGIS.StruxPts_v04_all"P6feature = r"DatabaseConnections\PipelinePathways.sde\PPGIS.Strux\PPGIS.Land_Projects_Parcels_P6"SDE = r"Database Connections\PipelinePathways.sde"UserID = "E1B8"Parent = "SDE.DEFAULT"version = "change_RW_VC_4447_14_to_C"#Create Versionprint "Creating version"arcpy.CreateVersion_management(SDE, Parent, version, "PUBLIC")VersionName = UserID.upper() + "." + version#Layersarcpy.MakeFeatureLayer_management (Struxfeature, "Struxlyr")arcpy.MakeFeatureLayer_management (P6feature, "P6lyr")#Switch to versionprint "Switching version"arcpy.ChangeVersion_management("Struxlyr", "TRANSACTIONAL", VersionName)arcpy.ChangeVersion_management("P6lyr", "TRANSACTIONAL", VersionName)#Start editingprint "Initiating editing"edit = arcpy.da.Editor(SDE)edit.startEditing()# Start an edit operationedit.startOperation()#Change P6 project numbers print "Updating P6.\n"P6Cursor = arcpy.da.UpdateCursor ("P6lyr", ["P6_NBR", "Name"])for row in P6Cursor: codecodecodeThe error comes from the line 'for row in P6Cursor:'

Traceback (most recent call last): File "C:\E1B8\ScriptTesting\ScriptsIUse\ChangeP6.py", line 81, in for row in P6Cursor:RuntimeError: workspace already in transaction mode

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