What is the Effect of Unapplied BR-Voucher in GL and Cust Ledger

Hi All,

i have bank receipt voucher no 1656 that is posted with knock off customer invoices and after some days i open customer ledger entries and select this voucher & click on function >> Unapply Entries >> Unapply then all invoices removed from applied entries of this voucher & all amt showing -ve as per below image:-

 but it is not removed from cust ledger entries it is showing total of above amt as per below screen :-

i want to know it is correct or not because other correct vouchers showing credit amt in cust ledgr rpt and can i post another BR to knock same invoices again.

Pls suggest me i will very thank full to you.

Kamal