Baseline date for customer in FBL3N

Hi SAP Experts,

I have a requirement to add baseline date for customers in FBL3N. I know FBL3N is GL line item report and in FBL5N I can see the base line date. But The requirement is to run the report FBL3N for customer GL accounts. In FBL3N Base Line can be added in change layout but it does not give any result. I was able to add offset account which shows the customer numbers by BTE. Can somebody help and guide how I can display base line date in FBL3N?