Alter table after it is replicated in HANA

Hi,

I wanted it check if we can alter a table (add a column in SLT) that has already been replicated in HANA? Do I need to drop the table and reload it if I want to populate this additional column for existing records?

e.g - BKPF (115 columns)

Need to add Fiscal year period column (concat GJAHR and MONAT) in SLT. Also need to populate this field for all the existing records and not only for new records that flow in after the creation of this column.

Thanks

Sameer