Yes unfortunately there is no way to "convert" to extended GDG.

On Thu, Feb 23, 2017 at 08:04 Vernooij, Kees (ITOPT1) - KLM <
[email protected]> wrote:

> Hello group,
>
> We like to start using Extended GDGs for the nice LIMIT(999) feature.
> I found that I can ALTER a GDG to a LIMIT > 255, but only if it is an
> Extended GDG.
>
> I could not find that I can ALTER an old GDG to an Extended GDG. Is this
> not possible and can I only define a new GDG as Extended?
> This means, delete the old GDG, including the 255 members, define the new
> GDG and restore and roll in the 255 members?
>
> Thanks,
> Kees.
>
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