Open the 
Unapply Customer Entries window.
Unapplies (undoes) erroneous applications in the customer ledger entries. You can unapply customer ledger entries from the Customer Ledger Entries window and the Detailed Cust. Ledg. Entries window.
By unapplying already posted applications, you can reopen closed customer ledger entries. All G/L postings that may have derived from the erroneous application, such as payment discounts and currency gains/losses, will be corrected when you unapply an entry. Note that you can only unapply an application entry, if the original application entry is the last application posted to any of the involved customer ledger entries.
The window contains one line for each detailed customer ledger entry related to the application you are about to unapply. You cannot change the information in the fields on the line, except for the Document No. and the Posting Date, if relevant.
When unapplying, the program creates and posts one correcting entry (an entry identical to the original entry but with opposite sign in the amount field) for each of the lines shown in this window. To cancel the unapply, simply close the window.
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