The PrimeFaces process and standard JSF execute attributes should point to spaceseparated component identifiers of components which JSF should process during the entire JSF lifecycle upon an ajax request (get request parameters, validate them, update model, execute action). The process defaults to @form, the current form, and the execute defaults to @this, the current component. In command links/buttons this is mandatory to execute the actions associated with the link/button itself.
However, in your datatable you have process="@this infoAnggaranForm:Anggaran", thus two components to process. If you omit @this but keep the other component, then it will only process/execute the other component and not the link/button component. If you omit the process attribute it will default to @form. If you have more other input components in the same form, then they will also be processed.
Depending on the concrete functional requirement, you could just keep it process="@this infoAnggaranForm:Anggaran", or omit it. JSF will then process/execute at least both the button and the other component, exactly as you want.