How do I create a Combobox in an Openbravo window?
For example, have a look on how Price list version drop-down list is displayed in Product Selector window with the new combo system. First, add the new field to Product_F1.html file inside info folder (View). Then create ProductCategoryCombo_data.xsql file with the query inside ad_combo folder (Model). Then link html and xsql files through Product_F1.xml file inside info folder. Finally, add a new method to Product.java file inside info folder (Controller). There is more information on how to create (or modify) manual windows in Openbravo ERP at Openbravo developers Manual.