AC27 GSM objects incompatible with former versions?

[pedrocollares]

I edited a GDL object of the AC27 BRA standard library, using AC27 only because of the GDL interface, and it turns out incompatible with AC26 and former versions.

It's a very simple object, made out of AC27 BRA library electric fixture, which is present with no apparent changes in previous versions as well.

When I try to open the PLN with AC26, object is unavailable. If I try drag and drop, or Ctrl+C/Ctrl+V, it gives errors:

Ctrl+C/Ctrl+V, puts out 'Unknown version':

Drag and drop says object is invalid:

As far as I remember, .GSM objects weren't version-dependent until now, am I wrong?

Is there some simple config I might be missing?

(The object does not reference or 'call' any AC27 library object - In AC27 if I remove all libraries it remains intact)

[Jochen Suehlo]

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@Barry Kelly wrote:

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I am unsure of the LP_XMLConvertor can help here, I have never mastered using that.

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Yes the LP_XMLConvertor can help. I am using it since AC 9 or so and I can always convert objects from a higher Archicad version to a lower on, e.g. from AC 27 to AC 22. (On MAC the use is very simple: you can create Automator routines for this, which are called by the context menu)
If you do this you must be aware of new GDL commands which are not supported in lower AC versions. The check script will tell you in most cases.
Example: You cannot use DICT commands in AC 22.