Reg: Session locked after come back from tcode

Hello Expert,

We are calling the Transaction code VAP1 of AAA SAP System

on click of the button in webdynpro abap application  which is created In BBB SAP System using the Iframe UI Element,

When the transaction VAP1 is opened,  if user press the back button it comes to the Main screen,

but when we try to call the VAP1 transaction once again it tells the error

Account XXXXXXXX is currently blocked by user XXXX.

If i go and see in AAA System , there is an lock entry in SM12,

so how can delete this lock entry from on click of the cancel button

or how to come out from VAP1 transaction when user clicks the cancel button to avoid the lock entry ?

See the attachment for the reference.

Please Help me on this ....

Thanks,

Sankar