Improper knock off occurs when using the Journal Entry module and the entries are improperly created.
Sample of incorrect entry.
the Trade Debtor row has a Business Partner selected but no document is selected.
With no document specified, this creates a entry instead of knocking off the value.
Sample of correct entry
The trade debtor row has a Business Partner selected and a document selected.
in this entry, the system will knock off value from the indicated document.