Is it possible to change the TYPE of object from Reference document to drawing document in PDM Link?

You cannot change the type of an existing object.  Unless something changed in the newest version.

I came across documents in the past that were not the correct type.  We ended up exporting the documents, deleting them in PDMLink then creating them again as the correct type.

You can change a WTDoc to a different type of WTDoc. The only caveat is you will orphan any attribute values where the attribute is not in the target WTDoc.

If you toggle the WTDoc back to the original type the orphaned attribute values will reappear on the WTDoc.

So, anytime you change type you should also remove the orphaned attribute values from the database. It’ll do no harm to leave them but do you really want orphaned entries in the database.

You cannot change a WTDoc to an EPMDocument. You must stay within the object’s class. Any type under the class is fair game.

I actually wrote a utility that runs in a Windchill shell to do this. To run it you enter a class, number and if attributes that are not in the target type should be deleted or not.

The utility confirms there is an object of the class and number and then displays all the subtypes of the class. You select the type you want and all iterations get changed.

The utility worked great and came in handy when you needed it. If could also run by reading a file in the event we needed to edit a lot of objects.

David

I recommend that you make a new wtdocument of the appropriate type, check out the part to add your new described by wtdocument object and remove your old references document type wtdocument object, then check in the part (assuming there is only one latest version to update and you don't have other view versions to similarly update). You cannot generally delete a document while it is linked to a part iteration, even an old one. 

Alternatively, delete latest iterations of revisions that reference the original document, then delete the old document, and make a new wtdocument of the right document type to then check out the part, add the described by link, and check it in.

I suppose a final way would be to delete all iterations of the part and the bad document, then just a new part with a new wtdocument of the right type and link to the new part. But  that is difficult if the part has been used by any other parts in a product structure since you won't be able to delete all iterations of a part still used by other part iterations, even if they are not the latest iterations.

There is no administrative way to re-type an object. We have some custom programs we have made over the years for mass conversions of one kind or another to change something we decided that we didn't like any more, but they were always specialty jobs. We have never made any customization that can ad hoc change any wtdocument of one type into a wtdocument of another type.

Now, if I really really had to do it and I couldn't just make a new document for some reason, then I would go to my DBA or local programmer in Windchill who knows SQL, and talk that programmer through the steps of finding the tables in the columns in WTDocument that link to its document type, change that to the new type, then find all the links to light type attributes and attribute values for the document to remove them and replace them with attribute links and values for the new type, then finally find all iterations of all wtparts everywhere to change any references links they have to the WTDocument Master to remove them, then replace them with new Describe by links from latest part iteration per version to latest document iteration per version. That may or may not be all the necessary changes, but I'd start there and see how it went. All of that would be difficult for an experience programmer and fraught will all kinds of peril for an inexperienced developer who will inevitably miss, forget, or mess up something and be unable to fix it without PTC support because none of that would be supported. So, be sure to back up any tables you work on before you try anything, and be sure to do the testing on a couple of non-production environments before any production environments.  Depending on your system and the complexity of the document type data, that kind of change will usually run into some odd PTC-internal column or link table that you break and then have to figure it out as you go with testing, trial, and error.