Hi,
As Amlan has stated, for paid Security Deposits, proceed as follows:
a) First re-set the Payment document/s clearing using Transaction FP07
b) This will open up the Security Deposit Request document/s
c) Vis Transaction FPSEC2, reverse the Security Deposit Request/s
d) Perform Account Maintenance using Transaction FP06 in order to clear the resultant Open Credits
I hope this helps.
Regards,
Ivor