Unable to change auto-generate user ID in R12

Summary

Unable to change auto-generate user ID in R12

Content

Hi all

One of our customers was previously about to change a new starters User ID in OIM to match their company's specific Windows User ID which is very specific e.g. first initial, first 2 letters of surname + country ID so Bob Smith in the UK would be BSMUK

In R12 the User ID appears to no longer be editable.

We have the right profiles because we are able to add roles, reset passwords etc but we just cannot change this field.

Any ideas?

Thanks!