Field help (CDAACCSNS) 

Specify the posting sense of the payment lines entered for this payment attribute:

Payment sense
If the sense of the entry is defined as the payment sense, the amounts entered for this payment attribute are considered as being expenditures or revenues based on the sense of the posted open item or the payment sense.

Expenditure/Revenue
If the sense of the entry is defined as being an expenditure or a revenue, the amounts entered for this payment attribute will always be considered as such, irrespective of the payment sense.
For instance, charges on a check are always considered as an expenditure, be it a check received or issued.

In the absence of a journal posted on the payment line, the payment sense prevails (see documentation on Payment transactions)