I may not have fully understood your query. However, it appears that you want to change the ECN prefix from WCE25 to WCE26. Please verify the OIR used for the ECN, as the prefix should be configured through the OIR.
It would be the one associated with "Change Notice" type. Keep in mind that OIRs are inherited. They can be defined at the site, org and product/library level. Most likely you have it at the site or org so look for it there. You should see one of them as a section that calls out your prefix. Also, based on your prefix, looks like you prefix with the year? Does that mean there is a unique number tacked on to the end that increments? If this is based on a DB sequence, note that this will not reset to 1 automatically. What does your full number look like?
