If you create a new patron record and manually assign a unique cardnumber (userid in the borrowers table) and Koha identifies a possible duplicate record, clicking OK to create the user as a new user causes the manually-assigned userid to be replaced with the user's firstname.lastname. The manually entered userid should be remembered (as long as it is genuinely unique).
PIN numbers in the duplicate records are also affected by this bug and are subject to changing automatically.
Hi Emma - is the PIN number an extended patron attribute in your installation? How is it configured?
Hi Katrin, By "PIN", I think Emma means the password field, mapping to borrowers.password. It has been renamed on this customer's system, hence the confusion.
That makes sense - thx for clearing that up!
I cannot longer recreate, this has been fixed.