How to update custom column data in an approved compensation Plan

Summary

GDPR requirement to remove data from specific custom column

Content

Hi,

We have a GDPR requirement to remove certain data from a compensation plan(for past 4-5 years) which relates to a custom column. The plan in question is a salary plan and the compensation data has already been sent to Core HR. The changes we are looking for need not be updated in Core, but just the compensation plan needs to be updated. The last approval action for the plan is approved, i have changed the status to work in progress. but the access level remains as no updates allowed. Can you suggest ways to to remove the data from the