You can achieve this through Rules in Remuneration Statement If its in R/3.
PE51 -> enter your Remuneration statement form -> Window (Radio button) -> double click on the specific window -> Display Groups in Window EA table (screen) appears -> double click on the group -> Display layout of Group 01 screen appears. Here enter your Wage type /561 and select the Rule under Rule column
this rule you define in
PE51 -> Rem Statement name -> Rule (Radio button)
If you are using smart forms, Developer can do this with your inputs and by using Adobe forms.
Or u can write very small rule to query specific wage type and store that in RT with negative sign.
Hope it helps!
Warm Regards!
-Kanuku