There are two ways. 1. Remove the - OnAccount from the Table 2. Write - Control Attribute at Field level if the selected value is OnAccount
If you are a USER, then I suggest you not to implement this, as removing this may cause error to prior data / vouchers which has "on account" selected.
[#Collection: Bill Methods] Title : $$LocaleString:"Method of Adj." Type : Methods of Adjustment Format : $Name ClientOnly : Yes Add:Filter : FilterOnacOnly [System:Formula] FilterOnacOnly : $Name Not contains "OnAccount"