Are there problems having an all numeric ACF2 logonid?
It is acceptable to have an ACF2 logonid that is fully numeric.
There is only one concern with using an all numeric logonid and that relates to
the default prefix for tso usage.
A dataset name prefix cannot be all numeric.
If a user attempts to allocate a dataset using this numeric ACF2 logonid as a prefix, the allocation will fail.
If the logonid will not be used to access the system, this should not be a problem.