When you receive Competency connector expection as "This Competency cannot be changed as there is Assessment History using this Competency".
SuccesFactors Learning (LMS)
Learning Management System
The issue occurs when the Competency is already used for Assessments.
If you are fine with updating records then you need to enable the below property by setting it to true (As per below mentioned property).
This desicion is up to you as it will update the records with assessment also.
To enable the below proproty, please navigate to System Admin>Configuration>System Configuration>Connectors
Competency Connector This Competency cannot be changed as there is Assessment History using this Competency Exception 3301 , KBA , LOD-SF-LMS-COR , LMS Core - Items, Catalog, Curricula , Problem