Managed Metadata values scrambled when copying or moving documents from one Site collection to another.

Question

Hi
What works: Copy or move a document library containing one or more MM columns *within* a Site Collection = all column managed metadata replicated accurately.
What doesn't work: Copy or move a document library containing one or more MM columns *from one Site Collection to another* within the same Webapp. The issue is that some but not all MM values are totally wrong. By totally wrong I mean that the incorrect
terms are associated with a TermSet that is not even referenced in this DL!
Same result for all method's tried:
1) Save the DL as a template (no contents) and then copy or move the documents in
2) Programmatically do the copy
3) Export the list via CA and then reimporting it using Pshell
This thread is very similar but his workaround has not helped in this instance:
https://social.msdn.microsoft.com/Forums/office/en-US/6aca7b7c-97cb-4f1f-99f1-5e1fa0b1e3ed/content-type-hub-custom-library-template-managed-metadata-lostscrambled-when-moving-files?forum=sharepointdevelopment#65b52342-408f-47b4-a9f8-5d0b952acc12
Has anyone else experienced this and found the cause/solution? Or can anyone do this without the issues that I have described?
Thanks

Answer 1

Hi Nuno,
I've got to the root of the issue but in answer to your question first: The MM column is attached to a Global Content Type - there is nothing local.
The fact that some are ok and others are not led me down the route of checking the columns at item level. Scripting this did not help - all rows returned are what I would expect. ie The same MMColName with the expected value (as appearing
on the source DL).
On checking SharePoint manager however I have found what looks to be causing the issue.
When checking the properties (ie SiteCollection/Lists/<ListName>/items/<itemName>/Properties) of the 'good' documents against the 'bad' documents I find the following:
Good Docs: The MMColName is displayed as expected at the item level
Field: Name
Field:  Internal Name
Item Properties:
Ok?
Partnership Type
Partnership_x0020_Type
Partnership Type
Y
Bad Docs: The MMColName is NOT displayed as expected at the item level. Instead the internal name is displayed:
Field: Name
Field:  Internal Name
Item Properties:
Ok?
Register Type
Type_x0020_of_x0020_Licence
Type_x0020_of_x0020_Licence
N
Meeting Type
Meeting_x0020_Type
Meeting Type & Meeting_x0020_Type (Both columns are listed)
N
I should add that each of these 3 examples are taken from 3 different DL's - hence the different Fields
So this looks to be a case of corruption - and unless we can think of any other outcome we will have to look to rebuild the DL - while trying to maintain the metadata!