How does rollback work?

[seema]

I am trying to Rollback the updates after updating the ECC with FM : HR_MAINTAIN_MASTERDATA .

CALL FUNCTION 'HR_MAINTAIN_MASTERDATA'
EXPORTING
pernr = pernr
massn = massn
actio = 'COP'
begda = datum
IMPORTING
return = return
TABLES
proposed_values = proposed_values.

rollback work.

It does not rollback (ie the changes are still there).
How do i use Rollback Work in this case?

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[seema]

you should this function: BAPI_TRANSACTION_ROLLBACK